Nice pair of black cable hangers with liners for cantilever brakes. One sided straddle cables are required. They work by attaching to the end of the brake cable in a cantilever brake system, and is what the brake's straddle cable (also sometimes called a transverse cable or crossover cable) is nestled into. These feature a lovely plastic liner which is great for preventing damage to your straddle cable where it passes through the cable carrier, but this also means you will need a one-sided straddle cable, so you can pass it through the tube.