Feature: 1. Aluminum alloy material, durable and corrosion‑resistant, surface anodic sandblasting process for good hardness and hand feeling, which brakes quickly and resets in time. 2. Dual‑piston drive principle, both sides drive friction discs, the brake pads automatically return, stable brake, and the braking force is strong. 3. The three‑dimensional cylinder design, the vertical cylinder can provide a larger piston in a shorter distance, and can brake easily with a light pinch. 4. Resin brake pads do not damage the discs and further enhance the braking effect. 5. The ergonomic design of the three‑finger brake lever makes it easy to operate the brake and has a strong braking force. Specification: Item Type: Front and Rear Disc Brake Set Material: High-strength Aluminum Alloy Body Product Color: Black Product Size: Front Oil Tube Length: Approx. 800mm / 31.5in Rear Oil Tube Length: Approx. 1400mm / 55.1in Fit for 160mm / 6.3in 6 Nail Disc Suitable for 22.2mm / 0.9in Handlebar Installation Size: Standard B Columns: Approx. 51mm / 2.0in Standard A Columns: Approx. 75mm / 3.0in Common for B and A Columns Weight: Approx. 695g / 24.5oz Type: 2-Way Brake, Hydraulic Disc Brake Cylinder:Three-Dimensional Cylinder, you can brake with a slight pinch. Package List: 1 x Front Hydraulic Disc Brake1 x Rear Hydraulic Disc Brake 4 x Screw Set