Crayon Rocks are completely non-toxic. Made from all natural soy wax and made in the USA. These unique soy crayons are vibrantly colored and create beautifully textured artwork similar to oil pastels. They glide smoothly on paper, and blend and layer beautifully! Crayon Rocks were developed by a teacher and designed to strengthen the tripod grip muscles, preparing fingers and hands for handwriting. For children, Crayon Rocks are just plain fun! WARNING: Choking hazard. Not for children under 3 years. Use with appropriate supervision.