Futaba CRS503/BB 7kg Retract Servo (P-CS503R/BB) The CS503 is a lightweight low profile servo with 180 degrees of travel designed specifically for use with mechanical retractable undercarriage & similar specialist functions. Fitted with nylon gears & a ballraced output, it also has a slower transit speed for greater realism. Specification: Weight: 28g Dimensions: 42 x 21.5 x 22mm Speed: 0.31 sec/60° (4.8v) Speed: 0.27 sec/60° (6.0v) Torque: 6.1 Kg/cm (4.8v) Torque: 7.0 Kg/cm (6.0v)