This is the Futaba S9353 High Voltage, High Torque, High Speed Servo

FEATURES: Designed to be used with models requiring especially high torque and
high speed
Metal casing helps dissipate heat
One year limited warranty through Hobby Services beginning at
date of purchase

INCLUDES: Futaba S9353 Servo with  1.7" (43mm) 3-point Horn, 3x8mm Servo Horn
Screw, four Eyelets, two Rubber Grommets and Instruction Sheet

SPECS:    Speed: 0.07 sec/60° at 6.6V
0.06 sec/60° at 7.4V
Torque: 272 oz/in (19.6 kg/cm) at 6.6V
305.6 oz/in (22.0 kg/cm) at 7.4V
Size: 1.59 x 0.83 x 1.47" (40.5 x 21 x 37mm)
Weight: 2.72oz (77g)
Power Supply: DC 6.0 - 7.4V
Horn Screw Size: 3x8mm
COMMENTS: Must be used with 2.4GHz radio systems for full performance