Diameter 0.5 mm.

The Kuru Toga Uni-Ball mechanical pencil is a revolutionary retractable pencil that prevents the persistent problem of a chisel-shaped lead that occurs with other models after use at a typical writing angle.

Kuru Toga's unique gear mechanism turns the lead every time it comes into contact with the paper, meaning your point remains cone-shaped and able to deliver fine, precise lines. It's also much more resistant to breakage.