Features 1、Low starting and rolling resistance, roll quietly and smoothly. 2、360 degree swivel allows the castor to move flexibly in different directions. 3、The wheel has good wear resistance, would not scratch the floor. 4、High toughness, shock adsorption. 5、Suitable for various trolleys, furniture, dining cars, office chair, etc. Specification Features: Low starting and rolling resistance, roll quietly and smoothly. 360 degree swivel allows the castor to move flexibly in different directions. The wheel has good wear resistance, would not scratch the floor. High toughness, shock adsorption. Suitable for various trolleys, furniture, dining cars, office chair, etc. Specification: Material: PP + Metal Quantity: 4pcs Product Size: 4*4*5.5cm / 1.57*1.57*2.17in Weight: 230g (approx.) Package List: 4 * Casters Package List