As a youth, I used to go bowling often. There were special pencils for keeping score. Despite pangs of guilt, I made off with them if I needed them for my collection.
The leads of these bowling pencils are of two general types: Thick graphite for paper, and opaque yellow or white for overhead projector transparencies. The latter are fairly easy to wipe off.
Note that Blaisdell, Moon, and General all made ones having the product number 300, the score of a perfect game. And General has five different brands! A couple of their numbers are frustratingly close to 300.