Features 1、Material and Technology: High strength aluminum alloy accurate manufacturing, strong and light weight, to ensure the brake friction force stability. Semi metal brake lining with widen contact surface has strong braking. 2、Double Piston Performance: Double piston drive is more reliable, both sides of the same force friction, will not lead to disc deformation. Compared with single piston, double piston has more stable braking force and better driving performance. 3、Oil Brake Braking: When oil brake braking, pinch the brake handle and oil pressure is directly transmitted to the pistons on both sides at the same time, promote the brake pad, hard clamp the disc will be held to death, so that the brake transmission efficiency is higher and more stable. 4、Special Design: Integrated cylinder design, strong sealing, reduce maintenance times, more oil amount, better heat resistance, more stable performance. Brake handle mounting is telescopic to adjust the diameter, 25mm/1.0in inner diameter is suitable for most models on the market. 5、Disc Brake Performance: All aluminum alloy forged caliper, double piston drive, pistons on both sides at the same time to push to make the disc to hold the disc and not making it swing. Brake pad has automatic positioning function, mineral brake oil, can still maintain good braking performance under high temperature conditions. 6、Oiling Line: High quality oiling line with PVC surface layer, good sealing, waterproof and anti aging, able to do heat dissipation in the key position of oil transmission from the clamp to oil pipe. Specification Item Type: Hydraulic Bicycle Brake Material: Aluminum Alloy Oil Pressure Disc Brake + Stainless Steel Brake Disc Color: As Shown Application: For Road Bike, Mountain Bike Weight: Approx.1126g/2.5lb Brake Specification: Front Brake: F160/R140, "F160/R140" F Stands For Front,R Stands For Back,160 And 140 Refer To The Disc Diameter (mm). Rear Brake: F180/R160, "F180/R160" F Stands For Front,R Stands For Back,180 And 160 Refer To The Disc Diameter (mm). Brake Size: A Pillar Distance: Approx.75mm/3.0in B Pillar Distance: Approx.51mm/2.0in Brake Disc Size: Diameter: Approx.160mm/6.3in, Thickness: Approx.1.8mm/0.07in, Hole Spacing: Approx.44mm/1.7in Length Of Brake Line: Front: Approx.77cm/30.3in, Rear: Approx.167cm/65.7in Hydraulic Disc Brake Type: Double Piston Brake Handle Index: 3 Fingers Brake Handle Installation: Within 25mm/1.0in (Adjustable) Hydraulic Disc Brake Features: Integrated Brake Handle Cylinder, Avoid Brake Handle Oil Leakage And Intake Trouble, Lightweight Design, Simple And Beautiful, Bilateral Brake Piston, Stronger Braking Force, More Stable And Reliable Performance, 3 Finger Brake Handle, Easy To Operate, Easier To Use, More Flexible For Emergency Response. Package List 1 x Front Oil Pressure Disc Brake 1 x Rear Oil Pressure Disc Brake 2 x Brake Disc 12 x Screw