These ingenious, triangular shaped crayons won't roll away. Made of plastic, not wax, for additional durability, this set of 24 rainbow color crayons stay on the table--just where your little artist put them! They pack into their own sturdy, plastic flip-top case for easy clean up. The unique shape will help kids develop the preferred grip for later writing skills. 3+ years. Conforms to ASTM D-4236.