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. AP certified non-toxic. Round stick 3-1/4" x 3/8" fits most chalk chucks. Includes 12 sticks in assorted colors per pack. Sold as 24 packs for a total of 288 chalk sticks. This product ships in approximately 1 days