Features: Made of high-quality carbon fiber and metal, durable and wear resistant, not easy to rust. The stem top cap can effectively waterproof and dustproof, protect the bearing performance. Easy to install and use, suitable for bicycles with a front fork stem diameter of 28.6mm. Light weight, no burden on riding, suitable for MTB, BMX, mountain bike, road bike, etc. Delivery includes 6 headset spacers, 1 screw bolt, a expansion hanging core, and a stem top cap.