Powerhobby MX53 Internal Spool Metal Gear Brushless Winch Servo Features : High Torque / Speed Brushless Servo Winch CNC Aluminum Casing BEC Not Required Internal Machined Spool 6 Feet .8mm Synthetic Line w/ Scale Recovery Hook Specs : Size: 40*20*41.5mm (1.57 x 0.78 x 1.63 in) Operating Voltage: 4.8-8.4 V Operating speed: 0.11sec/60° @ 6.0V (90 RPM) Operating speed: 0.10sec/60° @ 7.4V (100 RPM) Operating speed: 0.085sec/60° @ 8.4V (118 RPM) Stall Torque: 40 kg-cm (470 oz-in) @ 6.0V Stall Torque: 49 kg-cm (540 oz-in) @ 7.4V Stall Torque: 55 kg-cm (625 oz-in) @ 8.4V Gear: Metal Gears Motor: Brushless Waterproof