One way to lighten up your bike and get that technical carbon look is to replace your metal spacers with these super light 100% carbon fiber spacers. You will get the 1 1/8" tube size 5,10,15,20mm thicknesses in one package. Contains: 5 mm thick x1 10 mm thick x1 15 mm thick x1 20 mm thick x1Specification: Material:Full Carbon Fiber Diameter: 28.6mm( 1 1/8") Net Weight: 26g (4PCS)