This is the HS-82MG Metal Gear Micro Servo from Hitec. FEATURES: For small planes, gliders, electric helicopters and 1/18 scale cars INCLUDES: HS-82MG Metal Gear Micro Servo with universal connector, 0.67" (17mm) diameter horn, 1.1" (29mm) double arm, 0.90" (23mm) 4-point horn and mounting hardware REQUIRES: Installing in model and connecting to receiver SPECS: Speed: 0.12 sec/60° at 4.8V 0.10 sec/60° at 6.0V Torque: 38.88oz-in (2.8kg-cm) at 4.8V 47.22oz-in (3.4kg-cm) at 6.0V Weight: 0.66oz (19.0g) Size: 1.17 x 0.47 x 1.16" (29.8 x 12.0 x 29.6mm) COMMENTS: The following replacement parts are available; Gear Set, HRCM6386 Horn Set, HRCM6326 jxs 2/26/08 ir/jxs