Since 1882 Prang Art & Craft solutions has maintained uncompromised quality to ignite the passion of our valued, creative customers. Efficiency without sacrificing quality! Superior Chalk made from 95% pure calcium carbonate and free of foreign materials to create a smooth drawing experience. Prang Hygieia Chalk is easily removed to keep you chalkboard looking new and ready for the next task. Available in white, yellow, and assorted colors. This chalk is AP certified non-toxic. 12 sticks packed in a box.