Excellent manufacturing process and double hard steel support brackets enable to hold over 650 lbs wheel,Wheel materials are made of high-quality soft polyurethanes, which are high mechanical strength, wear resistance, shock absorption and low-noise<br><b>Caster Wheels size</b><br>Wheel diameter: 3"<br>Wheel thickness: 0.9" (24mm)<br>Installation height: 3.5" (90mm)<br>Stem Diameter:7/16" (11mm)<br>Stem Length:7/8" (22mm)<br><b>Safe You For All Floors</b><br>Made with a rubber caster tire, the chair casters wheels are ideal for any floor type. Your delicate hardwood floors and expensive carpets will not get scratched nor damaged by the wheels of your office chair. Forget the irreparable marks left behind by traditional chair wheels. These ones will treat your floors with the utmost care<br><b>Universal Stem Size</b><br>Fits all office work chairs sold in the USA with 11mm stems. Please Check that your chair is compatible. (The stem size is 7/16"(11mm) diameter by 7/8"(22mm) length)<br><b>Quick and Easy Installation</b><br>Orders come with a set of 5 office chair replacement casters wheels that can easily be installed without tools or hardware. Simply pull out old wheels and push these into place.