Caster Barn's SUPREME rubber caster wheels have a special compound of highly resilient, high quality, soft rubber bonded to thick aluminum wheel centers. Unlike Conventional Moldon rubber caster wheels, PREMIUM rubber caster wheels can be moved manually when loaded to their rated capacities. Selecting SUPREME rubber caster wheels means you do not have to give up the benefits of a resilient wheel (full floor and cargo protection) in order to get roll-ability. SUPREME rubber caster wheels are dependable, require little or no maintenance, and improve efficiency in manually moved operations.