★ LIFETIME WARRANTY - Our warranty never expires, so if you EVER have any issues, we'll send you a brand new set of wheels. We’re the only brand that offers and stands behind a full lifetime warranty. ★ SAFE FOR ALL FLOORS - Many chair wheels use cheap, low quality materials that destroy your flooring. We don't. Encased with soft, polyurethane material our rollerblade style wheels are guaranteed not to scratch or leave marks on any surface (including hardwood, carpet, tile, laminate and more). ★ QUICK AND EASY INSTALLATION - No tools required! Easily remove and replace the wheels in your desk chair in less than 30 seconds. Simply pull out your old caster wheels and pop these in. Check out our quick replacement video for more details.