Non-toxic. Crayola chalkboard chalk is strong and therefore less likely to break. Each stick provides consistent color throughout the stick. Have fun with chalk! Use chalk on construction paper, cardboard boxes and paper bags to create games, puppets, masks and much more! Safety Information: ACMI - AP: Arts & Creative Materials Institute Certified. Conforms to ASTM D 4236. All Crayola art materials are non-toxic.