This is the HS-485HB Premium Standard Servo from Hitec. FEATURES: Ideal for 1/10 scale vehicle steering and throttle applications, .20- .60 class aircraft, boats and all EP and GP .30-.50 class helis Karbonite gear train that is four times stronger than standard plastic gears Three pole motor and single ball bearing output shaft INCLUDES: HS-485HB Premium Standard Servo, 0.94" (24mm) diameter round horn, 1.2" (31mm) diameter 4-point horn, 1.3" (34mm) double arm horn, 1.2" (30.5mm) single arm horn, four each rubber grommets, eyelets and mounting screws, universal connector REQUIRES: Installing in model and connecting to control linkage and receiver SPECS: Size: 1.57 x 0.78 x 1.49" (40 x 20 x 38mm) Weight: 1.59oz (45g) 4.8V 6.0V Speed: 0.22 sec 0.18 sec Torque: 66.6 oz-in (4.8 kg-cm) 83.3 oz-in (6.0 kg-cm) Drivetrain Type: Top ball bearing jxs 7/13/09 ir/jxs