Which tension color is recommended for a 10 yr old ?

It depends what the child is attempting to accomplish. Is it intended for rehabof an injury? if so check with the doctor or physical therapist. OR Is it to strengthen for a particular sport? If so, than how far along is the strength in that hand of fingers. Typically the 3 lb is for the elderly with arthritis or rehab from an injury. While the 5 & 7 pound are the most popular for all ages. However, advanced athlete find the 7 & 9 pound too "easy" and then need to advance to the PRO (more than likely too large for a 10 year old hand)You may want to look at either the TWO packs with TWO tensions , or the FOUR pack withall four tensions 3,5,7,9. Fr a child stick with the regular Gripmaster NOT the PRO.

Which tension color would be recommened for a 14 year old guitar player?

It may depend on the size of the 14 year old, male or female, beginner or experienced guitarist. The RED (7 pounds) is the most popular and since the tensions range from 3 pounds to 9 in the regular GripMasterto 13 pounds in the PRO, the 7 is a mid range tension.If the child is in progressing with the instrument, you may want to consider a twin pack with two consecutive tensions.I hope this helps.

I lost the cushion grip for my heavy tension model. Is there a way to replace it?

No, you will need to replace the entire grip.

Is simply squeezing it enough or are there any specific exercises I should try out?

Like others, I am not aware of specific exercises. I do, however, turn it "upside down" , putting my fingertips to palm side of exerciser, and depress two of the plungers with my thumb - thus exercising that oft-neglected digit. 

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🖐️ Unlock your grip’s full potential—because strong hands mean unstoppable hustle.

TRUSTED BY PROS - Used by elite athletes, musicians, and rehab specialists—join the ranks of top performers.
TRACK YOUR PROGRESS - Graduated tension levels let you measure improvements and push your limits with confidence.
PRO LEVEL RESISTANCE - Heavy 9 lb spring tension challenges your grip for next-level power and endurance gains.
PREMIUM BUILD QUALITY - Crafted with stainless steel springs and ABS plastic for long-lasting durability and smooth performance.
PRECISION FINGER ISOLATION - Target each finger individually to build balanced strength and dexterity—no finger left behind.

The Prohands Gripmaster is a professional-grade, spring-loaded hand exerciser designed to isolate and strengthen each finger independently. Featuring a durable stainless steel and ABS plastic construction, it offers 9 lbs of adjustable resistance to build hand, wrist, and forearm strength. Trusted by athletes, musicians, and rehabilitation experts, it supports improved dexterity, endurance, and injury prevention.

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Color	Black - Gripmaster
Material	Stainless Steel
Brand	Prohands
Item Weight	70 Grams
Style	Heavy (Black)
Tension Level	9 lbs
Product Dimensions	3.63"L x 2.88"W
Shape	Variety
UPC	768715216535 011711985326 400110300739 758895140034
Global Trade Identification Number	00768715216535
Manufacturer	Gripmaster
Item Package Dimensions L x W x H	4.69 x 4.53 x 0.63 inches
Package Weight	0.07 Kilograms
Item Dimensions LxWxH	3.63 x 0.88 x 2.88 inches
Brand Name	Prohands
Suggested Users	unisex-adult
Part Number	14003
Model Year	2015
Size	9 lb (Heavy Tension)

Prohands Gripmaster Hand Exerciser, Finger Exerciser (Hand Grip Strengthener), Spring-Loaded, Finger-Piston System, Isolate & Exercise Each Finger

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