Katu Rollerblade Office Chair Wheels Casters Rubber Replacement - Set of 5 - Safe for All Floors - Universal Stem Fit Most Chairs. Color Black & Black Star. T03BBS High Qality Soft Polyurethane Material Wheels - Soft PU will Protect Hardwood floors and the 3" Diameter Wheel Provides a Better and Smoth Rolling Experience. Easily glide across hard wood floors, carpet, mats, laminate, tile, slate, travertine, concrete, and small bumps without causing damage. No Tools Necessary - Universal Standard Size Grip Ring Stem - 7/16" x 7/8" (11mm x 22mm). Rotating 360 Degrees on Office / Computer Chairs. Very Easy to Install on your Office and Computer Chair. You may easily remove your old casters by using a glove or towel. Heavy Duty & Durable -Made with high grade steel. holds 550Lbs+ per set of 5 and come with a 5 Years Warranty. Ball Bearings System - High Quality Ball Bearings Provide a Silent/Smooth Rolling. Modern Design - The Katu Inline Skate Casters Comes In a variety of colors and styles, Some of Our models are KATU T01CGS, KATU T02CBS, T03BBS, KATU T04CGR, KATU T05CBR, KATU T06BBR.