Unique, patented crayons are specially designed for construction paper, craft paper and cardboard Opaque and vibrant on any paper. New color formulation assures that regardless of how light or dark y more→our surface is, your artwork is bright and brilliant. For convenient classroom and group use. Includes red, orange, yellow, green, blue, violet, brown, black, red-orange, red-violet, yellow-orange, yellow-green, pink, blue-violet, blue-green and white. Sturdy, compartmentalized packs provide a convenient, reusable storage unit. Conforms to ASTM D-4236. Certified AP nontoxic by the Art and Craft Materials Institute.