T-Plug Set (Male/Female). Includes Deans style (compatible with) metal connectors and heat shrink tubing. Some swear the connectors give you a better power flow for your airsoft battery. Highly recommended for those that want a full custom gun and wiring system to handle power beyond Tamiya stock connectors. Less electrical resistance (compared to a Tamiya connector) in your circuitry will help to increase your gun's rate of fire.To use, You will need to solder the ends of wire to the plugs, then apply heat to the tubing to seal. There's some great Youtube videos on how to do this.