Uni Ball Kuru Toga M5 450T Self Sharpening Mechanical Pencil. Premium Propelling Ultra Strong Diamond Infused Leads for Technical Drawing, Writing, Arts and Crafts & 12 Lead Refills. Fine 0.5mm

Gear mechanism rotates the lead so tip remains cone-shaped 40 touches will result in one complete rotation of the lead Uses extra-strong uni Nano Dia leads Features a replaceable eraser under its push button Lead refills included