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The secret of the Dura Ace BC-9000 brake cables is a polymer coating that when viewed under a microscope looks like a series of tubes wrapped around the cable. This means less surface area rubbing the internal housing liner and it holds grease longer. Main benefits are significantly less shifting effort and the feeling of a quicker shift action also improved braking power with remarkably less brake lever effort.
Polymer-coated brake cables (BC-9000) may only be used in combination with the brakes of the BR-9000/6800/5800/RS500/R9100/R8000 series. With other combinations the clamping of the brake cable is not strong enough. As a result, the brake cable may come loose and control of the brake may be lost.