Pirhosigma Bicycle Flywheel Washer Spacer Cassette Headset Gasket Hub Bottom Bracket Bike Cycling Flywheel Axle for MTB Road Bike 1mm 1.5mm 2mm (3 pcs) Description: 1) Material: Made of High quality of Aluminium Alloy with no Rust or Corrosion 2) It's easy to install with its special Design 3) It could be used not only on mountain bike but also on road bike 4) These spacers are good accessories for Bottom bracket or hub adjusting Features: 1. Color: Black 2. Size: There are 3 sizes of 1mm, 1.5mm and 2mm thickness 3. Material: Aluminium Alloy Package includes: 1 x 1 mm Spacer 1 x 1.5 mm Spacer 1 x 2 mm Spacer