Set of 2 RED and 2 YELLOW LEDS and 4 Wires with Plugs for the newest Heng Long TK6.0 and TK-6.1, should be long enough to reach the Front and Red LEDS in most 1/16 Heng Long tanks and WPL and JJRC Vehicles.The LEDS are already wired with a resistor for use with 5V-7.4V.You will need the tools and knowledge to solder and troubleshoot for correct installation of these.