1. Tubing Parameters: Front tubing is 800mm/31.5in long, and the rear tubing is 1450mm/57.1in long. 2. Usage Scenes: Whether you are climbing, off road, jungle, urban leisure driving, you can easily control it. 4. Brake Pads: Made of resin metal composite materials, the surface is smooth and flat, will not damage the brake disc, and there is no noise during braking. 5. Four Piston Mountain Bike Disc Brake: Bilateral hydraulic disc brake, compared with the same level of double piston brake, the braking force is increased by 20%, and the resistance wear is increased by 150%.   Specification: Item Type: Mountain Bike Hydraulic Disc Brake Material: Aluminum Alloy Weight: Approx.779g/27.5oz Braking Direction: Left Front, Right Rear Tubing: Front Tubing Length: Approx. 800mm/31.5in, Rear Tubing Length: Approx. 1450mm/57.1in Front Brake F160/R140, "F160/R140" F Stands for the Front, R Stands for the Rear, and 160 and 140 Refer to the Disc Diameter (mm). Rear Brake F180/R160, "F180/R160" F Stands for the Front, R Stands for the Rear, 180 and 160 Refer to the Disc Diameter (mm).   Package List: 1 x Front Brake 1 x Rear Brake 8 x Screw 2 x Olive Head 2 x Oil Needle 2 x Mounting Column