Spektrum S905 Standard Waterproof Metal Gear Surface Servo 15.7kg/0.18s 6.0V - 7.2V SPMS905S905 Large Scale WP Servo 15T P SPMS905 The Spektrum S905 is a large scale servo with impressive torque (537. 72 oz in at 6V, 555. 50 oz in at 7V) that keeps your vehicle moving in the right direction and in the toughest terrains. It is waterproof and can be used in 1 5 or 1 6 scale surface applications. Torque:@6v is 537. 72 @ 7. 2v is 555. 50 Speed:@6v is 0. 20 @7. 2v is 0. 18 Dimensions(WxLxH): 2. 34 x 1. 14 x 2. 17 in (59. 5 x 39 x 55. 2mm)