KATU BB506-14 Office Chair Caster Wheels Rubber PU 2" Modern Design Ideal for Hardwood Floors, 5 Unit/Pack, Black SAFE FOR HARDWOOD FLOORS, Office chair casters safe for all floors, hardwood, laminate, vinyl flooring, floor mats and more. STANDARD SIZE, This chair caster come with the standard 7/16" (11mm) stem and polyurethane wheels to better protect your floors. HEAVY DUTY, Set of 5 supports 550 lbs making it the best replacement for your desk or office chair. 5 YEARS WARRANTY, Eliminates the need of office floor mats. Install in minutes with no tools. SMOOTH MOVEMENTS, 2 inch wheels lubricated with Lithium grease for easy and smooth movement with a layer of rubber PU.