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Product Specifications: Material: aluminum alloy+rubber Weight: 13.4 ounces Color: Black Diameter: 2 inch Packing: 2* Olympic Barbell Clamp Feature: Safty is important when working with wetigh. Olympic Barbell Clamp Collars are made of aluminum alloy with rubber inserts, Prevent injury by adviod weight from silding during your training session. Rubber increase friction, having extra grip also won’t scratch the finish on your barbell. The quick release mechanism allows you to easily unload your weight, allowing you to swap weight make your training process more coherent.