Sturdy and DurableYeMI replacement office chair rolls quad ball bearing design. Heavy-duty design supports up to 700 lbs as a set of 5, the STRONGEST chair wheels on . Rolling Office Chair Casters Made of high quality TPR to ensure excellent performance over time. Perfect replacement for office chair wheels.<br> Main SizeCastors Features a standard 11mm diameter x 22mm length stem and 50mm TPR twin wheels. Suitable for office, school, home etc., also for hard floor, wooden floor and other kinds of floors.<br> Floor ProtectionOffice chair casters are made of soft TPR to ensure your chair rolls smoothly and easily across the floor and won't leave any marks on your floor. Get a smooth, quiet ride while protecting your floors. Hardwood, carpet, laminate and ceramic floors included.<br> Easy InstallationOffice Chair Replacement Casters Simply pull your current casters down and push our replacement wheels into the socket. Attention to use: the axles are not removable. This smooth stem is not suitable for chairs with a threaded bolt caster stem.<br> Flexible Smooth RollingChair Caster Casters are quiet, smooth, non-marking, also suitable for floors irregular. 360 Swivel function ensures free movement in every direction, super smooth and smooth without noise, won't bother anyone while working.