Usually Super polyurethane wheel with nylon wheels, wheel, high-strength polyurethane wheels, high-strength synthetic rubber, pump the iron wheel, wheel. Super poly ammonia fat round, and high strength poly ammonia fat round regardless of in indoor outdoor of ground driving, are can meet you of handling requirements; high strength artificial type is can applies Yu hotel, and medical devices, and floors, and wood floor, and tile ground, requirements walking Shi noise small quiet of ground Shang driving; nylon round, and iron round applies Yu ground uneven or ground Shang has iron, material of site; and cheer round is applies Yu light load and the road soft not flat of occasions.