4-Piston Hydraulic Bike Disc Brake Aluminum Front and Rear Caliper Bicycle Brakes for Road Bike Mountain Bike The dual-brake four-piston directly transmits the oil pressure to the brake block to improve the braking efficiency. Even when you are Cycle downhill in a high speed, on a muddy road or under rainy, snowy weather, gently pull the brake lever to stop immediately. Features: Four piston calipers help you to stop your bike immediately and stably. Fit for 22.2mm/0.87in  diameter handlebar, suitable for most mountain bike, road bike, fixed gear Bike, etc. Anodized aluminum alloy frame provides strength, ruggedness, and corrosion resistance.  Length of front cable: 800mm，Rear cable: 1450mm Three finger brake operation. Specifications: Material: Aluminum Alloy Color: Black / Red / Blue / Purple ( optional ) Front Brake Oil Tube Length: 80 cm / 31.5 in Rear Brake Oil Tube Length: 145 cm / 57.1 in Front Brake Weight: 277 g / 9.8 oz Rear Brake Weight: 280 g / 9.9 oz Package Size:  21 * 20 * 8.5 cm / 8.3 * 7.9 * 3.3 in Package Weight: 575 g / 1.3 lb   Package List:  1* Pair of Bike Brakes