The wheels of casters have soft and hard choices: usually the wheels have nylon wheels, super polyurethane wheels, high strength polyurethane wheels, high strength artificial rubber wheels, iron wheels, and pneumatic wheels. Super polyurethane wheel and high strength polyurethane wheel can meet your transport requirements in both indoor and outdoor ground. The high strength artificial rubber wheel can be used in hotel, medical equipment, floor, wooden floor, tile floor, etc. The nylon wheel and iron wheel are suitable for the ground floor or ground with iron filings and other materials; And the air wheel is suitable for light weight and uneven road surface.