A. This mountain bike kit uses the M7000/M8000 titanium alloy screw kit specification, providing good compatibility for your cycling equipment. Made of titanium alloy, it ensures a certain level of quality and greatly improves durability, enabling it to withstand various complex road conditions. B. It is suitable for the transmission system, helping you flexibly adjust the speed during cycling and easily adapt to different terrain changes. It is also suitable for the hydraulic disc brake system, providing reliable braking performance to ensure cycling safety. C. It is favored by cycling enthusiasts in regions such as Europe, South America, Southeast Asia, North America, Northeast Asia, and the Middle East. D. With its excellent specifications and quality, this kit is an ideal choice for upgrading your mountain bike.