AlwaysLux Office Chair Caster Wheels (Set of 5) - Safe For All Floor Types Including Hardwood, Perfect Heavy Duty Replacement For Desk Floor Mat, Universal Fit Stem, Rollerblade Style 100% FLOOR PROTECTION: We guarantee that our hardwood floor chair casters will NEVER damage your wood floor or carpet! Say goodbye to the ugly office chair mat! LONG LASTING: Please DO NOT purchase if you're 250 pounds or more with chair combined as these type of wheels are NOT meant for such weights. (99% of negative reviews are from people who're above and beyond 250lbs) NO MORE MESS: Say goodbye to clogged computer chair wheels with hair and other gunk. No more getting stuck on wires or pet chew toys. Say goodbye to maintenance! QUIET & SMOOTH ROLLING: With dual ball bearings, get ready for super quiet and smooth rolling. Now, everyone and the baby can sleep while you work with your new chair casters. LIFETIME WARRANTY: We guarantee our ultra luxurious modern chair wheels for LIFE!  Need to contact us?Click sold by AlwaysLux on the listing =&gt; Click the "Ask a question" Button on the top right corner =&gt; Send us email. Become more effective &amp; productive at work. save money on expensive ugly floor mats Smoothly glide over all types of surfaces with ease! Gives your old chairs new life. Gives your new chairs upgraded performance. 3&#039; wheels make it faster and smoother to roll. Whisper quiet operation. Rubber casters won&#039;t scratch wood floor - throw away ugly floor mats! Fits 95% of all office chairs on the mnarket. (does not fit Ikea chairs) Universal stem (11mm). Measure before purchase. Upgrades mostchairs instantly! Rollerblade wheels will not scratch your hardwood floor. Smooth &amp; easy rolling. Silent Gliding Heavy-Duty construction Sleek Upgrade to conventional chair wheels. Wheels are easy to clean. No more gunk build-up. Pet hair, string, chew toys and dander will never slow you down or build up. Precision Ball Bearings for smooth rolling and Swivel Bearings For Smooth Rotation Save money by not having to buy a new chair!