Prang DIX61400 Hygieia Dustless Board Chalk, Assorted Colors, Pack of 12

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. Includes 12 sticks in assorted colors per pack. AP certified non-toxic.