... caster wheels 1.Type:plate,link.brake,or swivel caster 2.Material: aluminum alloy 3.Diameter:125mm aluminum alloy medical caster wheels Caster ... such as medical trolley ,hospital equipment.Caster detail specifiction1.Type:plate,link.brake,or swivel caster2.Material: aluminum alloy 3.Diameter ... swivel,rigid,link casters.3.Material: we also have many other types of casters,like nylon.PP,PU,PVC,Rubber ...