Crayon Rocks were invented by a special education teacher who saw a need to help young children, especially those with developmental disabilities, grow and train their tripod grip muscles so that writing would be easy and art fun. The perfect rock fell into her hands while repotting a plant. It can only be gripped and used with those all important three fingers: thumb, first and second. "How cool is that!" were the cries of her students. And then they all agreed that the colors had to be rich, vibrant and easy to apply. Thus was born the USA made Kentucky soy wax crayons that are ALMOST an oil pastel. Beautiful color that goes on paper with easy broad strokes. Perfect for the threenagers and older youngsters in your life!