Double bearing structure, flexible rotation without abnormal noise, high-strength aluminum alloy material, beautiful and bright, strong and practical. Features: Fine quality dual-bearing structure, smooth lubrication, easy maintenance, light and smooth turning handle. It is equipped with dual-purpose BaseRing and can be used for straight and tapered hose. Open BaseRing design, easy to use without tools. The headset is made of high-strength aluminum alloy, which is precisely processed. The weight is light and the strength is guaranteed. The headset is equipped with an expansion core, which is suitable for the carbon fiber front fork and is not easy to damage the front fork. Specifications: Color: black Material: aluminum alloy Applicable front fork size: standard straight hose front fork: upper 28.6mm, lower 30mm standard tapered hose front fork: upper 28.6mm, lower 39.8mm Package size: 50 * 50 * 30mm / 2.0 * 2.0 * 1.2in Package weight: 140g / 4.9ounce Packing List: 1 * Bicycle Carbon Frame Headset