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Listing is for a set of four (4) Service Caster Series #30 casters, two (2) swivel with total lock brakes and two (2) swivel casters, with 8" diameter by 2" wide polyurethane on aluminum wheel and maintenance free precision ball wheel bearings capable of supporting a total weight of 5,000 lbs. 8 Inch Poly on Aluminum Swivel Caster Set with Ball Bearing 2 Total Lock Brake The Series #30 features heavy duty polyurethane wheels that are chemically bonded to an aluminum core, providing a smooth roll over uneven surfaces without marking or marring floors.