Specifications from Futaba USA:
This is the Futaba S3305 High Torque, Metal Gear Servo. per Futaba this servo is approved for use with NiCd batteries ONLY! 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

SPECS:
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

COMMENTS:
Gear set FUTM3384 or DTXM3505 Case set FUTM2948