When it absolutely, positively needs to be quiet. Noiseless Duet Carpet Casters have a 7/16" dia. x 7/8" long stem fastener with dual grip ring technology to eliminate excessive noise. 2" dia. hooded dual hard nylon wheels for use on carpeted surfaces. Eliminates black powder residue created by metal-to-metal friction. Weight rating: 110 lbs/caster. Matte black finish. 5/Set.