Rubber wheels protect hardwood, laminate, tile, slate, and all other hard floor surfaces Features standard 7/16 inch (11mm) stem and easy-rolling 2" (50mm) twin caster rubber wheels Heavy-duty rubber caster wheels. Ideal for replacing existing office chair wheels and protect polished floor surfaces. High impact black polypropylene dust cover Eliminates the need for ugly expensive plastic floor mats.Note: Wheels should be checked and cleaned periodically Each rubber caster wheel can support up to 66 lbs. Eliminate the need for big plastic floor mats over your beautiful floors. Our safe rubber casters are the office wheels of the future. Perfect as a set of replacement caster wheels for home or office chairs that have hard, noisy, rough plastic wheels. Black and Gray to match and blend with any decor. Perfect for home or office use Scratches, scuffs, stuck wheels and noisy squeaks will be a thing of the past with our rubber caster wheels on your chairs. Install them quickly and easily (no tools required) simply pull off the old and snap in the new and you’re ready for sturdy support and stylish presentation.