Replacement Gear set for 422HDv2 Servo when installed in working servo, specs are as follows: High Torque Digital Coreless Servo SUBMARINE WATERPROOF: 7 Point Seals Magnetic Angle Sensor Pulse Width Modulation Control Fully Programmable w/ REEFS Software REEFS LINK required for Programming Voltage 4.8V - 8.4V Internal: Steel Gears / All CNC Aluminum Casing Bearing Type: 3 Ball Bearings / Weight: 2.85oz Dimension: 1.57 x .78 x 1.5 (LWH) Torque: 360oz @ 6v/ 400oz @7.4v/ 434oz @8.4v Speed: .13sec @6v/.11sec @7.4v/.10sec @8.4v Spline: 25T / Dead Band width: 2s BEC Not Req. Recommended for max performance