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 minimal effort, and you can use these bicycle stem spacers with confidence 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 spacer is measured by 35mm in diameter, while the outer diameter is about 42mm, suitable size to fit your speed cassette Sufficient quantity: you will get 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 spacer and 1 piece of black spacer 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.