Package includes: 4 items of casters wheels The product will be upgraded constantly, the arrival and coloration may be changed, please don't mind. And take a attention earlier than position the order when you have request for colour or appearance. Material: Polyurethane (PU) Steering: universal casters Diameter: 25/50 (mm) Maximum load: 25 (kg) Installation height: 39/65 Bearing: Sliding shaft, unmarried bearing Wheel width: 13/18mm