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This 4" x 1-1/4" Thermoplastic Rubber Swivel Caster (TPR) features a shock-absorbing cushioned ride, while providing good floor protection and quiet rolling operation. Featuring weight capacities of 75 to 1100 pounds per wheel, the 75 Shore A TPR wheel tread is chemically bonded to a polyolefin core and has an operating temperature range of -40°to +180° Fahrenheit. It is resistant to cleaning chemicals, acids, alcohol, and water, TPR wheels are an excellent choice for wash-down applications.
For more info, check out Caster Wheel Types.