●Quiet: No squeaking from the brakes rubbing,high temperature resistance, moisture resistance ●Material:Cable-Pull Front /Rear Hydraulic Caliper are made of high aluminum material, durable and stable ●Bike Disc Brake Set includes: 2 of steel 160mm Rotors, 1 set of front and rear Oil pressue cylinder driven Caliper , 12 disc brake rotor bolts, 4 Caliper bolts ●Hydraulic Disc Brakes: Cable-actuated rear-mounted disc brake calipers provide excellent braking power and are easy to service ●Compatible: Suitable for Mountain Bike MTB, Road Bike Mechanical Disc Brake System