A. This mountain and road bicycle fork headset stem is made of aluminum alloy. It is equipped with a carbon fiber fork expansion sunflower core screw, which is strong and durable, and can provide stable support for the bicycle fork, ensuring safety and stability during riding. B. The product model is D03, which has relatively strong adaptability. It can fit many mountain and road bicycles well. C. Whether it is for daily riding or mountain exploration, it can perform well. Its specifications are precise, and every detail has been carefully designed and manufactured to meet the requirements of cycling enthusiasts for bicycle parts. D. Whether you are speeding on flat roads or shuttling through rugged mountains, this fork headset stem will be a reliable cycling companion for you.