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 Amazon. Rolling Office Chair Casters Made of high quality TPR to ensure excellent performance over time. Perfect replacement for office chair wheels. 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. 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. 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. 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.