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!!

ASIN	B004OHNTVC
Additional Features	Soft Grip
Age Range Description	Adult
Age range (description)	Adult
Animal Theme	no animal theme
Best Sellers Rank	#2,127 in Office Products ( See Top 100 in Office Products ) #16 in Mechanical Pencils
Body Shape	Round
Brand	三菱鉛筆
Brand Name	三菱鉛筆
Closure Type	Retractable
Color	Gun Metallic
Colour	Gun Metallic
Customer Reviews	4.7 out of 5 stars 8,607 Reviews
Drill Point	Medium
Global Trade Identification Number	04902778129494
Grip Type	Soft
Hand Orientation	Ambidextrous
Hardness	HB
Included Components	Mechanical Pencil
Ink Base	Water
Ink Color	Black
Ink colour	Black
Item Diameter	0.5 Millimeters
Item Dimensions	14.5 x 1 x 1.3 centimeters
Item Type Name	Uni Mechanical Pencil, Kuru Toga Roulette Model 0.5mm, Gun Metallic (M510171P.43)
Item Weight	0.03 Pounds
Line Size	0_5mm
Manufacturer	Uni
Material	Metal Plastic
Material Type	Metal Plastic
Model Name	Mechanical Pencil
Model Number	M510171P.43
Recommended Uses For Product	Writing
Style	Gun Metaric Body
Subject Character	Kurutoga roulette model
Theme	Mechanical Pencil
Unit Count	1 Count
Water Resistance Level	Not Water Resistant
Writing Instrument Form	Mechanical Graphite Pencil
Writing instrument form	Mechanical Graphite Pencil

三菱鉛筆 uni Core Keeps Sharp Mechanical Pencil, Gun Metallic (M510171P.43)

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