A bowden cable is a device for the flexible transmission of small mechanical
movements, generally to the controls of a machine. It consists of a strong
steel cable (usually multi-stranded and lubricated) in a flexible outer
tube, often made in the form of a long coiled spring. The outer tube is
anchored at the ends so that the inner cable can move independently. Bowden
cables are commonly used for throttle (accelerator), clutch, choke, and
sometimes brake controls on cars and motorcycles.