Crayon Rocks are soy-wax crayons. They are free from petroleum or animal products. Their rock shape helps young kids develop their tripod grip (for writing). They are smooth and soft and go onto paper or fabric beautifully easily. They were developed by Barbara Lee. She worked 23 years as a primary school special education teacher. She noticed how many of her students could not write well, and learned how important for handwriting it is to develop a strong tripod grip - the younger the better. Made in USA What it contains:  A muslin cotton bag with 8 crayon rocks: red, green, blue, yellow, black, brown, orange, purple