This is the optional Aluminum Heat sink with Cooling Fan for the Traxxas Velineon
VXL-3 Electronic Speed control from Hot Racing
FEATURES:

Screw Secure clamp on aluminum heat sink.
Added heat sink cooling area.
Mount higher to allow better airflow
High velocity Fan
Simple installation
Plug right in with the VXL-3S ESC.

YOU WILL RECEIVE:
One High velocity Fan
One set of heat sink Mount