Yokozuna Ultimo Disc Brake. Features: Reliable cable-actuated disc brake, perfect for CX, Road and Gravel Four piston design for ultimate power and control Compatible with any cable-actuated Road brake levers Caliper features a Closed Hydraulic System, using mineral oil Dual Piston pad action with simple one knob pad adjustment Includes forged caliper, pads, caliper mounting bolts, 6-bolt 160mm rotor, and Reaction premium compressionless cables. IS adapters are included with the 74mm calipers Specs: Kit:rear Caliper:flat mount Rotor:160mm Color:black Weight:145g (caliper only)