Is your RC car's motor or ESC getting too hot during a hard run? Keep things cool and protect your electronics with this 40mm x 40mm cooling fan! It's the standard size used for many 1/8 and 1/10 scale RC vehicles like buggies, trucks, and crawlers. It bolts directly onto the heatsink of your brushless motor or ESC to provide active cooling. This little fan spins at a brisk 16,000 RPM, pushing a good amount of air to dissipate heat and help prevent thermal shutdown or damage. The body is made from a lightweight, durable alloy. The screw hole distance is 32mm for easy mounting. Please note, the color is random (you might get blue, red, black, etc.). It's a simple, affordable, and essential upgrade for any serious RC enthusiast who wants to push their vehicle harder and longer without overheating issues. Just make sure you have a spare channel or a Y-harness to power it from your receiver or ESC!