Features: brand new and high quality High quality meterial,made of premium aluminium,lightweight and durable,improve the apprance. Easy to install,accurate size,convenient install and remove,no need too much for time or labor. Heat dissipation,good heat dissipation performance, effectively prevent the motor from overheating. Durable and portable,exquisite workmanship,durable for long term use, increase the service life of your RC car Practical design,upgrade accessories,enhance overall performance in terms of operation and durability of your RC car. Specifications: Operating voltage: for DC 5V 1.5A RPM: 21000RPM Material: Aluminium Weight: 50g Color:Blue/Orange/Red Size: Approx.6x3x4 for cm/2.36x1.18x1.57 inch Suitable for 1/10 HSP RC Car 540 550 3650 3660 3665 3670 Brushless Brushed Motor. Note: Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package includes: 1 Piece Cooling Fan