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The secret of the Dura Ace BC-9000 brake cables is a polymer coating that looks like tubes wrapped around the cable under a microscope. This results in a smaller surface area that rubs against the inner casing cladding. Grease is also kept longer. The main advantage is more braking power with considerably less effort at the brake lever.
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.