This is the Series 10 Gauge Wire Harness from Castle Creations. FEATURES Connects two battery packs in series enabling the voltage to be doubled INCLUDES Series 10 Gauge Wire Harness with two Deans male plugs and one Deans female plug REQUIREMENTS Connecting to batteries and electronic speed control SPECIFICATIONS Wire Length Between Connectors: 5" (127mm) Wire Size: 10 gauge COMMENTS Use only identically prepared packs with this harness. Both packs must be fully charged and properly balanced. Both packs must be from the same manufacturer, have the same C rating, capacity and level of charge at all times. Failure to observe this warning will result in battery damage.