Crayola crayons are made primarily of wax, not clay or rubber. The exact composition of Crayola crayons is proprietary information, but they are predominantly made from a combination of paraffin wax, pigments (colorants), and various additives to achieve desired characteristics such as color intensity, smoothness, and durability. The wax allows the crayons to be easily applied to paper and creates a vibrant and consistent color when used.