Convenient Bicycle Accessory: These Aluminum Alloy Steering Wheel Hub Spacers fit 10 speed cassette on 11 freehub, 7, 8, 9 speed cassette on 10 11 speed freehub, 7 speed cassette on an 8, 9-speed freehub QUALITY MATERIAL: Made of anodized aluminum alloy, these bicycle spacers are lightweight and durable, helping you achieve good symmetry with effort, and you can use these bicycle stem spacers with Multifunctional Spacers: These bottom bracket washers can be applied to most bikes 7 8 9 10 11-speed cassette freewheel conversion, bottom bracket adjustment Detailed Size: The inner size of the is measured by 35mm in diameter, while the outer diameter is about 42mm, suitable size to fit your speed cassette Sufficient : you will 10 pieces of speed cassette bicycle spacers, which consist of 2 pieces of 1mm, 2 pieces of 1.5mm, 2 pieces of 2mm, 2 pieces of 2.5mm, 2 pieces of '3mm spacers, each size has 1 piece of red and 1 piece of black Material:Aluminum alloy colour:Black+red Package Contents: 2 x 1mm spacers 2 x 1.5mm spacers 2 x 2mm spacers 2 x 2.5mm spacers 2 x 3mm spacers Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.