Katu Rubber Wheels Office Chair Casters - 2 inch (Set of 5) Black & Blue Rubber Wheels for Office Chair Casters, safe for hardwood floors, laminate and more. This Office chair wheels come with the standard 7/16" (11mm) stem and 2 inch polyurethane wheels. The only casters in the market that actually supports 550 lbs as set of 5. 5 years warranty. Eliminates the need of office floor mats. Install in minutes with no tools. Lubricated with Lithium grease and a layer of rubber PU for smooth movement.