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This school approved dustless chalkboard chalk is 95 percent pure calcium carbonate. It-s free of materials that work their way onto the board surface and cause scratching, streaking, and pitting.The round sticks measure 3 1/4 in. x 3/8 in. and fit many chalk chucks. The chalk is AP certified nontoxic.Box of 12 assorted colors contains two each of green, yellow, blue, pink, orange, and purple.