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.

• 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
• Special mineral cohesion agents ensure clean, dust-free use.