Features 1、Fine quality dual-bearing structure, smooth lubrication, easy maintenance, light and smooth turning handle. 2、The headset is made of high-strength aluminum alloy, which is precisely processed. The weight is light and the strength is guaranteed. 3、AntiOxidation, smooth after prolonged use, and long service time. 4、The bottom bracket opens, and it can be installed with a gentle press, which is convenient and quick. It perfectly connects the front fork and the lower bowl bearing, allowing for smooth rotation. 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. The headset is made of high-strength aluminum alloy, which is precisely processed. The weight is light and the strength is guaranteed. AntiOxidation, smooth after prolonged use, and long service time. The bottom bracket opens, and it can be installed with a gentle press, which is convenient and quick. It perfectly connects the front fork and the lower bowl bearing, allowing for smooth rotation. Specifications: Color: black Material: aluminum alloy Applicable frame size: straight hose frame of 44mm inner diameter, 50mm outer diameter Package size: 50 * 50 * 50mm / 2.0 * 2.0 * 2.0in Package weight: 130g / 4.6ounce Packing List: 1 * Bicycle Headset Package List 1 * Bicycle Headset