With bold colors and an ingenious, triangular shape, these crayons are made of plastic, not wax, for additional durability. With their easy to grasp design, they won't roll away! This 12-color assortment comes in a sturdy, plastic, flip-top case. The unique shape will help develop the preferred grip for later writing skills. Dimensions: 0.75" x 4" x 6.25" Packaged Recommended Ages: 3+ years Conforms to ASTM D-4236.