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Amazon 3 Inch Premium Polyurethane Swivel Plate Locking Casters Wheels Set of 4 Red PU Anti-wear Smooth Casters with Brake, US $ 5 - 5.85 / Set, Customized, 1 9/64in, Polypropylene, POLYURETHANE, Steel, Polyurethane.Source from Guangzhou Ylcaster Metal Co., Ltd. on Waimaotong.com.