The Team Integy Slash 4X4 Motor Heatsink with Twin Fan is a great option part for those looking to keep the electronics in the Traxxas Slash 4x4 cooler. The motor heatsink will work for on a 550 or 540 size motor and features a nice blue anodized finish. The Cooling fan is powered through a JST style connector. Package includes one heatsink with two fans.