About this item The product is made of black anodized aluminum alloy material, with smooth surface, exquisite workmanship, strong and durable. The inner diameter of the product is 28.6mm, which is compatible with 28.6mm front bar forks of mountain bikes, mountain bikes, road bikes, etc. Product is very strong and easy to install, corrosion resistant, lighter than carbon fiber headset spacers and fits most bikes. The product is available in multiple sizes, 2mm, 5mm, and 10mm. The small-sized spacer spacers can be more accurately adjusted to the height you need. The product package contains: 5 pieces of 2mm, 5 pieces of 5mm, and 5 pieces of 10mm aluminum alloy bicycle front fork washers.