LIFETIME WARRANTY - Warranty never expires, if there is any quality problem with the wheels, we will provide you with a brand new set of wheels. Starting August 2023 FITS ALL FLOORS - Many office chair wheels use cheap, inferior materials that can damage floors. Ours will not. Guaranteed not to leave scratches or marks on any surface (including wood floors, carpet, tile, laminate, etc.) Our wheels work better in carpet than any wheels, which is something many wheels can't do. UNIVERSAL SIZE - Upgrade any rolling office chair with these sleek casters. Universal size wheel bars fit almost any office chair on the market. If for some reason they don't fit your particular chair, we'll give you a solution and even pay for return shipping. (Does not fit with IKEA chairs) EASY AND QUICK INSTALLATION - ! Easily remove and replace your office chair's wheels in less than 1 minute. Simply remove the old casters and put these wheels in. Give your chair a whole new life! HOLDS UP TO 800 POUNDS OF REAL WEIGHT - These casters are built to last a lifetime using the best materials available. If one of your chairs breaks, you can also move the wheels on top of another chair, the 3 inch wheels add height to your chair, and the wheels are sealed and designed so that they won't rust and grease up your floor. office chair wheels replacement, 3 inch soft polyurethane wheels for hardwood floors and carpet, heavy duty chair wheels with standard stem 7/16″* 7/8″, Set of 5 Lifetime Warranty