UNIVERSAL: These casters are a great replacement for typical office chair casters. Fit almost all office chair models available. Works great on hardwood floors, carpet, tile, concrete, stone, vinyl and etc. PROTECT FLOORS: No longer worry about cheap plastic casters dent or damage your beautiful floor. Our office chair caster wheels are incased with soft clear polyurethane which guarantees to not leave black marks or scratch any type of floors. QUIET & SMOOTH ROLLING: No More Floor Mat. Our office chair casters use vibration reducing polyurethane tires and precision ball bearings which make a quiet and smooth rolling.