Contemporary design, strength and performance make these replacement casters an excellent choice for office and home furnishings. Each caster can be used with wood, metal and tubular metal chairs, various pieces of furniture and other equipment. All casters carry the manufacturer's guarantee against defects in material and workmanship. To ensure proper support and safe rolling, neck must fit 1.5" diameter chair base so that base and caster fit together as a solid unit. Choose soft wheel casters for use on chair mats and hard floors. Choose hard wheel casters for carpeting. Deluxe Duet Soft-Wheel Casters—Fully hooded caster design. Soft polyurethane wheels for hard flooring and chair mats. Caster/Glide/Wheel: Caster; Color(s): Matte Black; Color Family: Black; Stem Type: Grip Ring Type B Stem.