Caster wheels could be made of plastic, polyurethane, stainless steel, aluminium, rubber or nylon. The material depends on the application, whether the caster wheel is to be used to wheel a light or a heavy suitcase.
Caster wheels could be solid, or they could have a spoke design. Wheels that are made of a single material are usually solid. The larger and heavier suitcases typically have stronger caster wheels. While the plastic caster wheels tend to be lighter and generally appear on small and medium suitcases, larger suitcases tend to have caster wheels made from stronger materials, such as stainless steel or aluminium.