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 yellow sticks per pack. AP certified non-toxic. Sold as 36 packs for a total of 432 pieces.

• This superior chalk is 95% pure calcium carbonate
• 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 many chalk chucks