The Compy 300 is a new generation of 300 class CP helicopter. It's CCPM main rotor and new belt-drive tail design is in highly positive comments. For beginners, it is a good machine in learning of hovering. For experts, you may go for invert flying and 3D actions depends on your skills!! Specification: Length:500mm Main rotor: 550mm Tail rotor:140mm Flying weight: 390g - 470gram Gross weight: 195gram Main gear: 140T Belt Gear: 40T Tail Gear: 11T Head/Tail Speed Ratio: 3.63 Recommended Electronic Parts (NOT included): CCPM Servos x 3 :Towerpro SG-90, TowerPro 5G Servo or E-Sky EK2-500 Gyro : EK2-0704A 8g Headlock Gyro , Futaba GY401 or Telebee Dual Rate HH Gyro ESC : Emax Sensorless Brushless Electronic Speed Controller 25A or above Motor : 400DH Outrunner Brushless Motor or E-Sky 28mm 3800Kv Outrunner Battery Requirement: Zeta-Plus 11.1v 1300mah Lithium Polymer Battery (20C-25C) Pinion: 9T or 10T