Crayon Rocks are all natural soy wax crayons made from USA grown soybeans and colored with mineral pigments. The 16 colors are vibrant and can be layered to make beautifully textured art work. They were designed to strengthen the tripod grip muscles, preparing fingers and hands for handwriting. Their shape allows small fingers to color in large, wide strokes creating pictures rich in color. They are used by occupational therapists to develop fine motor skills. Winner of the "Silver Parents Choice award 2014".