Master Caster 64334 Safety Casters,Standard Neck, Polyurethane, B Stem, 110 lbs./Caster (Set of 5) 2 inch diameter wheels feature an internal brake to prevent wheels from rolling freely when user stands Allows smooth effortless chair rolling while seated Weight rated 100 lbs. per wheel Soft casters for use on low to medium pile carpeting Pack of 5 casters