Gray interconnect cables used for Gavita fixtures that are equipped with double RJ connectors also know as Gavita Repeater Bus system. You can easily recognize them as they are gray instead of black, and have ferrite coils on each end to minimize interference of external signals. A standard 6.5 ft cable is included with every fixture to connect it to the next. Choose from these additional sizes of cable or create custom lengths with the 25 m/8 ft roll.