This superior chalk is 95% pure calcium carbonate and free of foreign materials that work their way into the board surface causing scratching, streaking and pitting. Round stick 3-1/4" x 3/8" fits most chalk chucks. AP certified non-toxic.

Key Features :

i : Easily removes to keep your chalkboards looking new
ii : Smooth on boards for easy writing
iii : Made from 95% pure calcium carbonate to provide supreme qaulity
iv : White