This 6" x 3" Forged Steel Swivel Caster is an ideal preference for those who desire a durable product qualified for carrying incredibly heavy weight loads, with concern for floor conservation. Forged steel caster wheels are made from a mixture of unique alloys that grant it higher weight capacities than cast iron caster wheels. They also feature an extra thick walled, heavy duty core, hub, and tread. These wheels will at no time flat spot which makes them optimal for heavy, immobilized loads.