Upgraded Office Chair - High Performance Casters - Office Chair Replacement Part - Improves Strength.All-metal rolling bar with high height provides years of lightweight rolling and durability.The sturdy design (set of 5) can bear 250 kg (weight). The wheel bar is strong and durable, and the design is more sturdy. Wide and thick double wheel structure, soft PU material, pressure resistant, quiet andsmooth, does not scratch the floor, does not leave marks on the surface.Each wheel uses four high quality ball bearings which are fashionable, comfortable, stable and quiet. Easy installation without tools or hardware. Simply remove the old R and slide it into position.The pin size is 11mm diameter x 22mm (7/8") L is compatible, connt for 99% office chairs (without IKEA).The wheels make your chairs look more fashionable and comfortable, making you satisfied with office chairs or ordinary chairs. The wheels will be the best choice to upgrade your chairs.