Tektro Orion Disc Brake (HD-M745). Features: The Orion is a high power, controllable brake that features a 4-piston caliper design Forged aluminum lever offers a reach adjust mechanism Lever can be combined with I-Spec II or Matchmaker 2-Finger lever blade 1900mm hose Semi-metallic brake pads included Rotor and adapter sold separately Uses mineral oil Specs: Kit: left Caliper: 74mm Rotor: seperate Color: black Weight: 314g