Prang Crayons are made from a unique soybean oil formulation. Unique blend of soybean oil and bright, intense pigments makes these crayons brighter, smoother and less flaky than ordinary wax crayons. Blend them together for an even more extensive color palette. Unique storage box with carrying handle is a convenient way to keep crayons together in one solid, refillable container. Crayons are certified AP nontoxic.