Does the tip retract? I'm worried about putting it in my pocket.

It does not retract. I've got three of these for each jacket I wear so I don't worry about forgetting to take a pencil. So far no problems with the tip...

is the body and cap a metal material

No the body and eraser cap are plastic material. However the grip, the end cap, and the lead sleeve seem to be metal.

Do you need to buy a special kind of lead for it?

Any 0.5mm lead will work, but the specific Kurotoga lead is softer on the outside and is purportedly more effective with the mechanism. For very dark writing, I prefer Neox lead but it can smudge/smear a little. My second favorite is Ain Stein lead, which almost never smudges and lasts a little longer (not quite as soft as Neox).

How durable is this? I am a graduate student in EE and math and break so many of the best mechanical pencils from staples and other office stores.

I actually bought this mp to add to my mechanical pencil collection. I now have about eight mps, all different. Therefore, I could not provide any info regarding its durability. I can say that this is a beautiful, finely crafted instrument. It may be the best in terms of appearance. I really don't think you would go wrong if you selected this one. Best of luck!!

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uni Core Keeps Sharp Mechanical Pencil, Gun Metallic (M510171P.43)

uni Core Keeps Sharp Mechanical Pencil, Gun Metallic (M510171P.43)

Product ID: 4042163

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Details

Brand
三菱鉛筆
Writing Instrument Form
Mechanical
Color
Gun Metallic
Ink Color
Black
Age Range (Description)
Adult

🔫Gun Metallic Finish

⚙️Lead Rotating Tech

🖋️0.5mm Fine Point

Description

✍️ Stay sharp, write smarter, lead the pack.

EFFORTLESS CONTROL - Ribbed grip ensures fatigue-free writing during long brainstorming sessions.
COMPACT LIGHTWEIGHT - At just 0.48 ounces and 5.7 inches, it’s perfectly portable for your on-the-go lifestyle.
SLEEK GUNMETAL AESTHETIC - Stand out in meetings with a stylish, durable metallic body that screams professionalism.
PRECISION THAT NEVER DULLS - Innovative Kuru Toga lead rotation keeps your lines sharp and consistent.
JAPANESE ENGINEERING EXCELLENCE - Crafted in Japan, combining reliability with cutting-edge mechanical pencil technology.

The uni Core Keeps Sharp Mechanical Pencil features advanced Kuru Toga lead rotating technology for consistently sharp 0.5mm lines, housed in a sleek gun metallic body. Lightweight and ergonomically designed with a ribbed grip, this Japanese-engineered pencil is perfect for professionals who demand precision and style in every stroke.

Specifications

Manufacturer	Uni
Brand	三菱鉛筆
Item Weight	0.48 ounces
Product Dimensions	5.7 x 0.4 x 0.5 inches
Item model number	M510171P.43
Is Discontinued By Manufacturer	No
Color	Gun Metallic
Closure	Retractable
Grip Type	Ribbed
Pencil Lead Degree (Hardness)	HB
Material Type	Metal, Plastic
Number of Items	1
Size	1 Count (Pack of 1)
Point Type	Fine
Line Size	0.5 Millimeters
Ink Color	Black
Tip Type	metal
Manufacturer Part Number	M510171P.43

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