White Nylon Caster Wheels are made with a solid nylon material. Black Nylon Caster Wheels are reinforced with glass fiber to increase capacity and reduce friction when rolling. Select Nylon Wheels with either stainless bearings or a plain bore for applications in which wheels are exposed to: Wash Down - Chemicals - Steam Cleaning - Cleaning Solutions- Salt - Organic Solvents - Brine - Grease - Blood - Oil. If you are unsure of your selection please contact us for assistance. These wheels weigh very little yet they have a load capacity comparable to most metal wheels. They will not develop a flat spot. Nylon wheels are a better choice in wet and corrosive applications which require both chemical resistance and a higher load capacity. Durometer: 70D ±5 for all Nylon Wheels.