Double layer design: The outer layer is made of high-quality aluminum alloy material, which is strong and , not easy to deform, and has a good heat dissipation performance. Hassle-free installation: The installation is very simple, and it can be installed in a few seconds without any tools. Adjust Tightness: Bike disc brake sets has elastic fine adjustment screw help you fine-tune the inner brake line to achieve an perfect brake feel. Compatible: Suitable for mountain, road, folding bikes, E-bikes, and electric scooters. perfect Replacement: with fine workmanship, is your bicycle perfect upgrade parts, and packed in a box to presented in the Widely Compatible: Suitable for most Mountain Bike, Road Bike Mechanical Disc Brake System. Colour:Black Material:Aluminum alloy Package Contents: 2x Front and rear clamp brakes 2x disc brakes 12x screws Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.