Power HD LW-25MG Servo FEATURES: All aluminum metal casing in black anodized color. Specs: Torque (6.0v): 23.0 kg-cm (319.4 oz/in) Torque (7.4v): 25.0 kg-cm (347.2 oz/in) Speed: 0.16 sec (6.0v) or 0.14 sec (7.4v) Operating Voltage: 6.0~8.4 DC Volts Weight: 72 g (2.54 oz) Bearing Type: Ball Bearing x 2 Motor Type: DC Motor Gear Type: Copper & Aluminum Working frequency: 1520μs/ 333hz Size: 40.7 x 20.5 x 38.6 mm (1.60 x 0.81 x 1.52 in) Note: When the digital steering gear is subject to resistance, a continuous creak sound will be produced. The greater the resistance, the louder the noise, this is a normal phenomenon. Not for use underwater.