DYU Outer&iner Tire D3+/D3F/D2F/V1/D1 Material: a mixture of natural rubber and butyl rubber The tire is made of rubber material, which has wear resistance, anti-skid, high quality and durability. 100% brand new, high quality, wear-resistant pattern, stable and safe The tire is easy to use and replace, and can be flexibly adjusted and fixed firmly.