This is the Team Integy Motor Heatsink with Twin Cooling Fans. For use on the Traxxas 1/10 Slash 4x4. FEATURES: Twin built-in fans Silver alumimum heatsink construction INCLUDES: Motor heatsink assembly with attached fan and BEC connector BEC pigtail REQUIRES: Fastening to 1/10 Slash 4x4 motor SPECS: Length: 2.4" (61mm) Width: 1.57" (40mm) Height: 1.65" (42mm) lmm 7.23.10 ir/jxs