ITEM NAME:540/550 Double Heat Sink Engine Cooling Fan For 1/10 Remote control car - T Q3I5 540/550 Double Heat Sink Engine Cooling Fan For 1/10 Remote control car - T Q3I5 Made from high quality aluminum and plastic, for 1/10 RC racing car, 36mm diameter motor. Two cooling fans protect the motor against overheating efficiency, easy to install. Operating voltage: DC 5V 0.15A Costume for 1/10 HSP RC Car 540/550 3650 Motor Inside diameter: 34mm Overall length: 60mm Width: 30mm Height: 28mm (calculated fan height: 38mm) Color: Titanium Material: aluminum + plastic The package includes: 1 * Engine heat sink with two cooling fans Only the above package content, other products are not included. Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.