Apex RC Products 540 / 550 Blue Aluminum Heat Sink W/ Two 30mm Fans #8042-BL
KEEPS Motors Cool! Make your electric motor run more efficiently by keeping it cooler!
HIGH Quality Aluminum Heat Sink & Fan
WORKS on 540 and 550 Size Motors
4.8V-6.0V Voltage Input - Powered By Any Spare Receiver Port
COMPATIBLE with most Traxxas, HPI, Tamiya, and Losi Electric Motors