* Snap O-Ring Rubber 25 PCS Bag Optional For Snap Or Snap Light * The optional rubber ring can be used to route cables even more accurately along the chord tube. In addition, the rubber provides axial resistance, so that cables can be pulled taut and straightened. * The specially adapted O-ring is robust, durable and of industrial quality, and is in no way comparable to ordinary household rubber. * Contents: * 25x Special rubber ring/O-ring