--- product_id: 3865113 title: "Ernie Ball Extra Slinky Cobalt Electric Guitar Strings, 8-38 Gauge (P02725)" brand: "ernie ball" price: "B/.39" currency: PAB in_stock: true reviews_count: 13 category: "Ernie Ball" url: https://www.desertcart.com.pa/products/3865113-ernie-ball-extra-slinky-cobalt-electric-guitar-strings-8-38 store_origin: PA region: Panama --- # Cobalt alloy boosts magnetic pickup response Extended dynamic range & harmonic clarity 8-38 gauge for ultra-light tension Ernie Ball Extra Slinky Cobalt Electric Guitar Strings, 8-38 Gauge (P02725) **Brand:** ernie ball **Price:** B/.39 **Availability:** ✅ In Stock ## Summary > 🎸 Unlock your guitar’s true voice with Ernie Ball Cobalt Extra Slinky – tone that demands the spotlight! ## Quick Answers - **What is this?** Ernie Ball Extra Slinky Cobalt Electric Guitar Strings, 8-38 Gauge (P02725) by ernie ball - **How much does it cost?** B/.39 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.com.pa](https://www.desertcart.com.pa/products/3865113-ernie-ball-extra-slinky-cobalt-electric-guitar-strings-8-38) ## Best For - ernie ball enthusiasts ## Why This Product - Trusted ernie ball brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Magnetic Powerhouse:** Cobalt alloy creates a stronger pickup connection for louder, richer tone that cuts through the mix. - • **Play Faster, Feel Lighter:** Extra Slinky 8-38 gauge strings reduce finger fatigue and speed up your fretboard runs. - • **California Crafted Quality:** Made in the USA with premium materials ensuring fresh, long-lasting performance every set. - • **Stay In Tune, Stay On Stage:** Engineered for stability even under aggressive bends and extended play sessions. - • **Crystal Clear Highs & Punchy Lows:** Experience a balanced sound with crisp highs and a robust low end that commands attention. ## Overview Ernie Ball Extra Slinky Cobalt Electric Guitar Strings (8-38 gauge) feature a revolutionary cobalt alloy that enhances magnetic pickup response, delivering an extended dynamic range with crisp highs and strong lows. Designed for fast, effortless playability with extra light tension, these strings are crafted in California from premium materials to ensure durability and consistent tuning stability, making them the go-to choice for professional and passionate guitarists seeking superior tone and performance. ## Description Engineered to maximize output and clarity, Ernie Ball Cobalt Slinky guitar strings are one of the latest innovations in string technology. Seeking to provide guitarists and bassists with a new voice, Cobalt strings provide an extended dynamic range, incredible harmonic response, increased low end, and crisp, clear highs. Cobalt provides a stronger magnetic relationship between pickups and strings than any other alloy previously available. Review: Sold on Cobalts! - These strings are amongst the 2 best for tone I've ever tried. I'd tried Ernie Balls before but never liked them. These stings are very balanced and sound better not only for chords but in comparison to the Fender 3150SL, 8guage, pure nickel I've been using, they are much stronger for solos, as well. Due to arthritis, I have to use 8 gauge and while different from the 9 gauge, which I did try, they don't sound thin and whimpy. The timbre also does not get thinner when playing above the 15th fret. These are very ballsy strings for 8's. Related, but perhaps guitar dependent is the following: I use a Fender Jeff Beck Strat. It has a roller nut. While it is better than a static nut, sometimes strings do get caught up and remain either sharp of flat. I play a lot, a couple of hours a day. Even after stretching, it took one week for the G string to settle in to tune. The other stings were typical of other good sets. I used them last night beginning week 3 and they are staying in tune very nicely. I know people ding 8's saying they never stay in tune, but I've been using 8's for quite some time. I found it is manufacturer dependent and yes, sometimes it is set dependent. But, sometimes you get a set of anything that lasts longer than others even with the same amount of use, so who is to really say. It's a thing of averages. This is my first set of Cobalt 8's and I'm testing the longevity , too. I am quite tough with bends on the first 2 strings often bending 2 1/2 steps. The first 3 strings still sound great after 2 solid weeks, though I think the low E is beginning to fade. That's pretty darned good life and even if I had to change them at the typical 2 weeks I get on the Fenders, I'd stay with these at the added expense because the tone is so good. Also note that I ALWAYS clean my strings after use and between sets, rubbing them down with Fender SLICK after wiping each string individually with a chamois. I found that with the Fender 3150s that doing this doubles string life. No joke. Doubles string life. So, here I go into week 3. If I remember to, I'll update this review. Review: love these strings! - i always used the blue steel Lt or xls like my 8. but this is first time with ernie ball cobalt extra slinky. was very surprised how much better the sound was in these types of strings.got them broke in lowest e pop right out? think slipped out under the wind? never ever seen that but after fighting back in ,and going over and under it. wound it on the tuning pegs.they are great sounding. way easier on the wrist and fingers.i have the grip from com. fishing. can't play for long at all but still like tryin. been tryin to make my action better on the warlock plus.so i can play longer without pain.this made BIG DIFERENCE IN SOUND AND PLAYABILTY, SUSTANE THAT YOU LOSS IN NORMAIL 8. STRINGS THIS IS 5 STAR SET! will try other ernie ball soon looking for more of the *8 ## Features - Cobalt produces a stronger magnetic relationship between pickups and strings than any other alloy previously available - Cobalt electric guitar strings provide an extended dynamic range, incredible harmonic response, strong low end, and crisp, clear highs - Wound strings consist of Ernie Ball’s Cobalt alloy wrapped around a tin-plated high-carbon steel core wire - Extra Slinky brings extra light tension for fast and easy play across the fretboard - Made in California, USA with the finest and freshest materials ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B007NCVWNW | | Best Sellers Rank | #357 in Musical Instruments ( See Top 100 in Musical Instruments ) #6 in Electric Guitar Strings | | Body Material Type | Cobalt | | Brand | Ernie Ball | | Brand Name | Ernie Ball | | Coating Description | Cobalt | | Color | Extra (8-38) | | Customer Reviews | 4.7 out of 5 stars 528 Reviews | | Finish Type | Uncoated | | Global Trade Identification Number | 00749699127253 | | Instrument | Electric Guitar | | Item Type Name | Electric Guitar Strings | | Item Weight | 18.14 g | | Manufacturer | Ernie Ball Music Man | | Manufacturer Part Number | 2725 | | Material Type | Cobalt | | Model Name | Extra Slinky | | Model Number | P02725 | | Number of Items | 1 | | Recommended Uses For Product | Electric Guitar | | Set Name | Ernie Ball Extra Slinky Cobalt Electric Guitar Strings | | Sound Profile | Bright | | String Gauge | .008 | | String Material Type | Cobalt | | UPC | 749699127253 | | Unit Count | 1 Count | | Warranty Description | None. | ## Product Details - **Brand:** Ernie Ball - **Color:** Extra (8-38) - **Instrument:** Electric Guitar - **String Gauge:** .008 - **String Material Type:** Cobalt ## Images ![Ernie Ball Extra Slinky Cobalt Electric Guitar Strings, 8-38 Gauge (P02725) - Image 1](https://m.media-amazon.com/images/I/81UTEdg5WJL.jpg) ## Available Options This product comes in different **Color, Size, Style** options. ## Questions & Answers **Q: Are these made from cobalt mined by dwarves in the mines of Moria? Someone on the internets said so.** A: Now we know why ErnieBall cobalt strings make most magical sound vibrations 🎶mines of Moria, dwarves & elvin magic ✨ **Q: Are they better for finger-picking?** A: I installed these strings on a 72 fender telecaster thinline with wide range pickups using a fender supersonic 60 watt tube amp and found the sound difference from the Ernie ball super slinky strings I usually use to be harsh. There was more treble then I wanted and an almost chimey sound from the higher notes. This is not a string suited for country music which is what I was playing. It accents the finger picking well by making each individual note stand out more clearly but the louder I played it started distorting and under distortion it was an unpleasant sound. Best stick to the tried and true Ernie ball slinky and super slinky for finger picking. In fact on my american start with single coils the slinky strings sound the best by far for country music. Tuffet to bend then super slinky but a much more rounded tonal quality then these cobalt strings. I hope this review helps. **Q: are these strings round wound or flat wound?** A: Strings are round wound. **Q: Are the 3-packs individually wrapped packages that can be sold separately? Or is it 3 sets of strings in one package?** A: The 3-packs come in one package, but you can separate them once you open up the package.If this was helpful, please consider purchasing from us. We can help with support after the sale as well. We have it in stock and ready to ship. - Pixel Pro Audio ## Customer Reviews ### ⭐⭐⭐⭐⭐ Sold on Cobalts! *by D***O on November 22, 2013* These strings are amongst the 2 best for tone I've ever tried. I'd tried Ernie Balls before but never liked them. These stings are very balanced and sound better not only for chords but in comparison to the Fender 3150SL, 8guage, pure nickel I've been using, they are much stronger for solos, as well. Due to arthritis, I have to use 8 gauge and while different from the 9 gauge, which I did try, they don't sound thin and whimpy. The timbre also does not get thinner when playing above the 15th fret. These are very ballsy strings for 8's. Related, but perhaps guitar dependent is the following: I use a Fender Jeff Beck Strat. It has a roller nut. While it is better than a static nut, sometimes strings do get caught up and remain either sharp of flat. I play a lot, a couple of hours a day. Even after stretching, it took one week for the G string to settle in to tune. The other stings were typical of other good sets. I used them last night beginning week 3 and they are staying in tune very nicely. I know people ding 8's saying they never stay in tune, but I've been using 8's for quite some time. I found it is manufacturer dependent and yes, sometimes it is set dependent. But, sometimes you get a set of anything that lasts longer than others even with the same amount of use, so who is to really say. It's a thing of averages. This is my first set of Cobalt 8's and I'm testing the longevity , too. I am quite tough with bends on the first 2 strings often bending 2 1/2 steps. The first 3 strings still sound great after 2 solid weeks, though I think the low E is beginning to fade. That's pretty darned good life and even if I had to change them at the typical 2 weeks I get on the Fenders, I'd stay with these at the added expense because the tone is so good. Also note that I ALWAYS clean my strings after use and between sets, rubbing them down with Fender SLICK after wiping each string individually with a chamois. I found that with the Fender 3150s that doing this doubles string life. No joke. Doubles string life. So, here I go into week 3. If I remember to, I'll update this review. ### ⭐⭐⭐⭐⭐ love these strings! *by J***E on April 11, 2015* i always used the blue steel Lt or xls like my 8. but this is first time with ernie ball cobalt extra slinky. was very surprised how much better the sound was in these types of strings.got them broke in lowest e pop right out? think slipped out under the wind? never ever seen that but after fighting back in ,and going over and under it. wound it on the tuning pegs.they are great sounding. way easier on the wrist and fingers.i have the grip from com. fishing. can't play for long at all but still like tryin. been tryin to make my action better on the warlock plus.so i can play longer without pain.this made BIG DIFERENCE IN SOUND AND PLAYABILTY, SUSTANE THAT YOU LOSS IN NORMAIL 8. STRINGS THIS IS 5 STAR SET! will try other ernie ball soon looking for more of the *8 ### ⭐⭐⭐⭐⭐ A step up from regular Super Slinkies *by M***R on March 18, 2026* I’ve been using Ernie Ball Super Slinkies since 1969. Tried a few others every once in a while but always went back to the Slinkies. But these are my new favorites. They’re like Super Slinkies on steroids. They’re great!! ## Frequently Bought Together - Ernie Ball Extra Slinky Cobalt Electric Guitar Strings, 8-38 Gauge (P02725) - Ernie Ball Zippy Slinky Nickel Wound Electric Guitar Strings, 7-36 Gauge (P02217) - Ernie Ball Extra Slinky Coated Titanium Electric Guitar Strings, 8-38 Gauge (P03125) --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.com.pa/products/3865113-ernie-ball-extra-slinky-cobalt-electric-guitar-strings-8-38](https://www.desertcart.com.pa/products/3865113-ernie-ball-extra-slinky-cobalt-electric-guitar-strings-8-38) --- *Product available on Desertcart Panama* *Store origin: PA* *Last updated: 2026-10-27*