Power HD R12, Low profile digital servo. Specs: Torque(6.0V): 9.0 kg-cm (125.0 oz/in) Torque(7.4V):12.0 kg-cm (166.6 oz/in) Speed: 0.07 sec (6.0V), 0.06 sec (7.2V) Operating Voltage 6.0 - 8.4 DC Volts Weight: 41 g (1.45 oz) Bearing Type: Ball Bearing x 2 Motor Type: Coreless Motor Gear Type: Titanium & Aluminum Operating Temperature: -20c to 60c Working frequency: 1520μs / 333hzSize: 41.0 x 20.0 x 26.4mm (1.61 x .079 x 1.04") Includes:1 R12 ServoServo Arm Basic mounting screwNote: When the digital steering gear is subject to resistance will be issued a continuous creak current sound, the greater the resistance sound the more loud, this is a normal phenomenon.