This headset spacer is made of high-quality aluminum alloy material, sturdy and practical to use. They are lightweight and easy to install, having smooth surface and exquisite workmanship. 4 different sizes into one packs could fit for your demand and meet different needs. Features: Made of high-quality aluminum alloy material, eco-friendly, sturdy and practical to use. Lightweight and easy to install, having advantages of smooth surface and exquisite workmanship. Perfectly suitable for 28.6mm front stem fork of MTB mountain bike, road bike etc. 4 different size(5mm/10mm/15mm/20mm) into on pack, they could fit for your demand and meet different needs. Specifications: Material: Aluminum Alloy Color: Red, gold, silver, black, blue (optional) 4Pcs/Set Size(Height): Approx. 5m/10mm/15mm/20mm For 28.6mm bicycle front stem fork Item weight: 32g / 1.1ounce Package size: 100 * 50 * 30mm / 3.9 * 2.0 * 1.2in Package weight: 36g / 1.3ounce Packing List: 4 * Bike Headset Washer