Fly Bikes Manual CNC OG Brake Kit has been given some serious refinements & improvements to create possibly the smoothest, most responsive Fly Bikes brake yet. The Manual CNC OG Brake is built from a combination of forged & CNC machined 6061-T6 aluminium keeping weight down & strength high. The OG version has been designed with thicker brass bushings for longer life, a smoother pull with the Allen Key Only spring plates & an adjustable A-hanger to help dial in your brakes.