High-Performance Hydraulic System: Experience enhanced braking power with ZTTO's precision-engineered hydraulic disc brakes, designed specifically for road and gravel bikes. The advanced hydraulic mechanism ensures reliable stopping power in various weather conditions. CNC Machined Precision: Crafted from premium CNC machined materials, these calipers offer superior durability and performance. The meticulous construction guarantees precise alignment and functionality over long-term use. Flat Mount Design: Our flat mount design is streamlined and lightweight, providing a clean aesthetic without sacrificing functionality. It's compatible with both 140mm and 160mm brake rotors, allowing for flexible installation and optimal performance. Easy Installation: ensuring that you can upgrade your bike's braking system with ease. This feature is ideal for DIY enthusiasts and professional mechanics alike. Color: Purple/Black/Red/Blue Material: Metal Package Contents: 1 x Hydraulic Disc Brake Calipers(Not including disc) 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.