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 freehubQUALITY 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 confidenceMultifunctional Spacers: These bottom bracket washers can be applied to most bikes 7 8 9 10 11-speed cassette freewheel conversion, bottom bracket adjustmentDetailed 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 cassetteSufficient 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 spacerMaterial:Aluminum alloycolour:Black+redPackage Contents:2 x 1mm spacers2 x 1.5mm spacers2 x 2mm spacers2 x 2.5mm spacers2 x 3mm spacersOnly the above package content, other products are not included.Note: Light shooting 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.