The OEM Crayola Kid's First Washable Crayon set includes 8 bright, large crayons designed for children ages 18 months to five years. These crayons easily wash off most walls and nonporous surfaces, as well as most children's clothing and fabric, using warm water and a sponge. Each crayon measures 4 inches long and 7/16 inch in diameter, and they are certified nontoxic, conforming to ASTM D-4236 standards.