Feature:1. Diverse Features: Gasket is light weight, easy to assemble and easy to install, glossy surface, and fine workmanship. 28.6mm / 1.1in internal diameter, 10mm / 0.4in width, 34mm / 1.3in outer diameter.2. Manufacturing Material: Made of high quality aluminum alloy material, environmental protection, strong and durable, which can undoubtedly effectively prolong the service life.3. Wide Applicability: It is suitable for mountain bike, road bike, fixed gear bicycle and so on with wide range of application.4. High Performance: The ability to replace old or damaged bicycle accessories greatly improves the performance of the bicycle, which undoubtedly effectively extends its service life.5. Easy to Use: Easy to use and fine workmanship. Without any difficult requirements even though you use it for the first time.Specification:Item Type: Bicycle Headset SpacerWeight: Approx.30g / 1.1ozMaterial: Aluminum AlloyProduct Size: Inner Diameter: Approx.28.6mm / 1.1inOuter Diameter: Approx.34mm / 1.3inWidth: Approx.10mm / 0.4inApplication: Suitable For Fixed Gear Bicycle, Road Vehicles, Mountain Bikes Package List:5 x Gasket