This is a Brushless Conversion Motor Upgrade Accessory Set.Easy to repair and install. This set is designed for ultra-miniature brush indoor helicopter, which is brushless conversion combo. To perform the upgrade, you will need this conversion kit, Walkera 4#3, Walkera 4G3 or similar coaxial heli, double sided tape, cable tights and necessary tools like screw drivers, motor pinion remover, etc. The powerful and efficient Brushless Motor design creates massive torque, which will allow you to direct drive larger props without needing a gearbox. Ultra high quality magnets provide massive torque and linear power.Time to enjoy the benefits this Brushless Accessory Set brings!