This is the Team Integy Motor Heatsink with Side Mount Cooling Fan. This heatsink snaps onto the motor can. FEATURES: This blue motor heatsink has a built-in fan Alumimum heatsink construction INCLUDES: Motor heatsink assembly with attached fan and BEC connector BEC pigtail REQUIRES: 540 sized motor SPECS: Length: 1.9" (48mm) Width: 1.5" (38mm) Height: 1.6" (40mm) ajw 9-20-05 ir/jxs