Casters feature dual grip ring technology that eliminates excessive noise for quiet mobility on all floor surfaces. Soft polyurethane material eliminates black powder residue created by metal-to-metal friction. Duet twin-wheel casters complement all types of office & home-office furniture. Smooth-rolling wheels provide maximum mobility on light-to-medium duty applications. Soft wheel casters with a 110 lb. per wheel weight rating are designed for hard floors & chairmats.