1、Made of high quality material with exquisite workmanship, which is durable, wear-resistant, lightweight and also eco-friendly 2、With stable and high performance 3、With strong wind and fast rotate speed, which can effectively reduce the operating temperature of the electronic speed control and motor 4、Special cooling fan for electronic speed controller and motor of RC model car 5、Available in 4 sizes, you can choose according to your needs Features: 1. Made of high quality material with exquisite workmanship, which is durable, wear-resistant, lightweight and also eco-friendly. 2. With stable and high performance. 3. With strong wind and fast rotate speed, which can effectively reduce the operating temperature of the electronic speed control and motor. 4. Special cooling fan for electronic speed controller and motor of RC model car. 5. Available in 4 sizes, you can choose according to your needs. Specifications: Condition: 100% Brand New Item Type:  RC Accessory Material: Plastic Weight: Approx. 10-18g Optional Size: 25 * 25 * 10mm, 30 * 30 * 10mm, 40 * 40 * 10mm, 50 * 50 * 10mm Size DC Voltage Rotate Speed Suitable For 25 * 25 * 10mm 5V 0.15A 8000-9000RPM ＜60A Electronic Speed Controller 30 * 30 * 10mm 5V 0.18A 13000-14500RPM for 3650 motor fan cooling fin 40 * 40 * 10mm 5V 0.25A 7000-8500RPM for 4074 4274 7282 1515 motor 50 * 50 * 10mm 5V 0.25A 8500RPM 150A Electronic Speed Controller Package Include: 1 x Cooling Fan