Description If you hit the right side of wrestling in riding, there is the opportunity to damage the ears, this case is very common, especially in long-distance riders, this accessory is best to become an essential piece. For bikes where the derailleur is held in place by the wheel nuts. Features - Color: Silver. - Material: Aluminum alloy. - Size: 4.60 x 3.00 x 0.70cm/ 1.81 x 1.18 x 0.28 inch. - It is suitable for most types of bicycles and can be replaced, which reduces the maintenance cost of the frame. - The tail hook is made of aluminum alloy, which is easy to install on the frame for fixing the rear dial. - The tail hook designed with expand the flywheel velocity change more smoothly. - Exquisite and compact shape, give your mountain bike a little individuation. - Made of materials, wear resistant and firm, durable and long service life. It is suitable for most types of bicycles and can be replaced, which reduces the maintenance cost of the frame. The tail hook is made of aluminum alloy, which is easy to install on the frame for fixing the rear dial. The tail hook designed with expand the flywheel velocity change more smoothly. Exquisite and compact shape, give your mountain bike a little individuation. Made of materials, wear resistant and firm, durable and long service life.