Next Generation casters are maintenance-free casters made of glass-filled nylon. Non-Magnetic options utilize reduced metal along with 316 stainless steel components to better operate in situations where reduced magnetism is necessary. 316S stainless steel precision bearings are insert-molded into the sealed raceway, providing a worry-free, smooth and quiet operation. Wheels feature Delrin plastic bearings and include full thread guards to reduce debris entanglement. Recessed axles are covered with plastic caps, and mounting hardware is constructed of 316S Stainless Steel. Next Generation casters are resistant to most chemicals.