This is the Futaba S3305 High Torque, Metal Gear Servo.
This servo can produce high-current draw from your batteries. If using NiMH or LiPo batteries, make sure they are capable of delivering sufficient amps.
FEATURES
Wide usage in cars and boats that require standard size, high torque servos Two ball bearings 3-pole motor Standard Futaba J style connector Metal gears One year warranty
INCLUDES
One Futaba S3305 High Torque Metal Gear Servo with 1.5" (39mm) diameter horn, 1.2" (32mm) 6 point horn, 4 eyelets, 4 rubber grommets, and 4 mounting screws
SPECIFICATIONS
Dimensions: 1.6 x 0.8 x 1.5" (1-9/16 x 16/16 x 1-1/2") (40 x 20 x 38mm) Weight: 1.7oz (1-11/16oz) (47g) Speed: 0.25 sec/60° @ 4.8V 0.20 sec/60° @ 6V Torque: 124 oz-in (8.9 kg-cm) at 6V 99 oz-in (7.1 kg-cm) at 4.8V