The permanently fused felt layers on these Madico Fusion Feltac(TM) casters provide scratch protection and noise elimination on hard surfaces. The double-wheel design improves maneuverability and mobility of furniture as the twin wheels rotate independently to make turning or reversing direction effortless. The furniture casters operate smoothly, making them suitable for use on hardwood, tile, linoleum and ceramic areas. Wood furniture mounting stems make them easy to install and secure. They are 2" in diameter and have a load capacity of 66 lbs (30 kg) per dual-wheel caster.