Feature:1. Made of highquality aluminum alloy material, it is environmentally friendly, strong and durable.2. Light in weight and easy to install, it has the advantages of smooth surface and exquisite workmanship.3. It has strong anticorrosion and durable. The surface does not fade and the color is beautiful.4. There are 2 different sizes (2mm/3mm/5mm/10mm), you can adjust the appropriate height according to your own situation.5. The headset spacer is perfectly suitable for 28.6mm/1.1in front stem fork of mountain bike, road bike etc.Specification:Item Type: Bike Headset Spacer Set Material: Aluminium Alloy Spacer Inner Diameter: Approx. 28.6mm / 1.1inSpacer External Diameter: Approx. 34.0mm/ 1.3inSteel Sunflower External Diameter: Approx. 31.7mm/ 1.2inThickness: 2mm / 0.1in3mm / 0.1in5mm / 0.2in10mm / 0.4inProduct Weight: Approx. 56-57g / 1.9-2.0ozCompatibility: Suitable for fork tubes with a diameter of 28.6mm / 1.1in.Package List:6 x Spacer 1 x Screw1 x Steel Sunflower1 x Top Cover