Crayon Rocks Eight Colors packed in a blue velvet bag. Eight primary colors: red, green, blue, yellow, orange, purple, brown, and black. Simply the best coloring tool for children! Crayon Rocks have vibrant colors and make beautifully textured art work. All natural soy wax crayons made from USA grown soybeans and colored with natural mineral powders. Designed to strengthen the tripod grip muscles, preparing fingers and hands for handwriting. The shape allows small fingers to color in large, wide strokes creating pictures rich in color. Used by occupational therapists to develop fine motor skills. Non-toxic and conforms to ASTM D 4236. Made in USA. Length of each crayon is approx 1 1/4" (Images on photos may appear larger). WARNING: Choking Hazard. Not for children under 3 years.