Master provides a variety of products to protect you and your office furniture. As the industry"s leading supplier, Master provides replacement casters for 99% of the office chairs on the market today. Contemporary design, strength and performance make these replacement casters an excellent choice for office and home furnishings. With appropriate stems and fasteners, all casters carry the manufacturer’s guarantee against defects in material and workmanship. The Duet Twin Wheel Casters are made of soft nylon for light or medium duty on chair mats, linoleum and vinyl tile, and wood and parquet flooring. These casters are specially made for five-leg chair bases. The dual 2 inch diameter wheels rotate independently for a smooth ride. The self-lubricating design ensures easy swiveling. Featuring a standard sized neck and weight rated at 100 pounds per caster, the Duet Twin Wheel Caster Set contains 5 casters and ten stems per set. The included stems are 5 each of 3/8 x 1 inch and 5 each 7/16 x 7/8 inches for mistake proof stem selection. The Master line of office organization and repair products provides "do-it-yourself" quick and easy office solutions for everything and everyone!