2.5" Office Chair Casters - SET OF 5 - Rollerblade Style. Grey 5-Star inner core with Black PU wheel - SAFE for Hardwood Floors & Carpet. Universal Easy Installation SAFE FOR ALL HARD FLOORS - Stop damaging your expensive hard wood floors with plastic desk chair wheels. AXL rollerblade rubber wheels for office chairs is an idea to protect any of your hardwood, laminate, tiles, wood. Encased with soft, polyurethane material on our office chair wheel casters are guaranteed not to scratch or leave marks on any surface. With our replacement of office chair wheels, you may feel free to toss that any old chair mat for hardwood floor. EASY ROLLINGS & QUITE CHAIR WHEELS- Dual ball bearings on caster wheels to have office chair casters provides smooth, easy rolling while causing no squeaky sounds or noise of any kind. STYLE OF CHAIR CASTER WHEELS  Our office chair wheels are designed with the universal standard size stem, so you can transform any desk chairs or stools that roll into modern, striking furniture. These wheels have been regarded as the absolute best upgrades to Herman Miller Aeron, Hon, and most of other brands on gaming chairs or desk chairs. (Besides using as desk chair wheel, some other products with 11x22mm friction ring stem are also replaceable with our office chair wheels.) EASY REPLACEMENT WHEELS FOR OFFICE CHAIRS - No tools required; Pull out your old desk chair wheels and push in your new chair casters until stem is firmly seated and secure. WARRANTY  At AXL, we have great faith in our rollerblade style office chair wheels. Our caster wheels come with a lifetime guarantee. For any issue with them, please feel free to contact us with your free office chair casters replacement.