Soft-Roll, ultra-light aluminum wheels feature a custom made aircraft grade aluminum hub that is machine lathed for perfect balance. The highly resilient solid urethane tread will not go flat and is designed to minimize energy loss and absorb vibration. Arched tread design ensures the contact surface is spherical to improve pivot ability. The extra width better distributes downward pressure allowing the wheel to maintain higher flotation and does not sink into the carpet, gravel, etc. Designed for those who want the ultimate smooth ride. Powder coated for a fun pop of color!