This is the Ace DC0915 Digital High Speed Micro Servo for the Thunder Tiger Mini Titan E325 Flybarless Heli. FEATURES: Four plastic output gears Single ball bearing supported output shaft Controls the rudder of the flybarless Mini Titan helicopter INCLUDES: Ace DC0915 Digital Micro Servo with Four Point, and Double Arm Horns and Mounting Hardware SPECS: Specs such as torque and speed not provided by manufacturer Dimensions: 0.87 x 0.45 x 0.93" (22.1 x 11.4 x 23.6mm) Weight: 0.32 oz (9 g) COMMENTS: Operate at 4.8V only jxs 11/19/12 ir/jxs