Hard Composition / Ultra High Capacity Polymer caster wheels are made from solid Nylon 6 that supports capacities that are comparable to metal wheels of the same size and this wheel cannot flat spot. Nylon is resistant to greases, oils, blood, acids, bases and more. This solid nylon industrial caster wheel is a hard composite material that can withstand shock loads and impact loads. This industrial caster wheel comes in 1-¼” wide and 2” wide, and comes in diameters ranging from 3” to 8”, depending on the width selected. This caster wheel comes with plain bore, precision sealed ball bearings, or roller bearings as well as coming in stainless steel ball bearings or roller bearings.