This is the Brushless Waterproof Monster Torque High Voltage Digital Servo, Black Edition from Savox. The powerful "Monster" performance series from Savox utilize an all aluminum case, unique brushless motor and controller technology to boost power up to 35% over previous generation servos.

Features:
Waterproof (IP67)
Full Aluminum Case
3 Precision Ball Bearings.
Unique steel gears

Includes:

(1) Servo

Specs:
Torque @ 6v - 40.0kg/555.5oz-in
Torque @ 7.4v - 50.0kg/694.4oz-in
Torque @ 8.4v - 65.0kg/902.7oz-in
Speed @ 6v - 0.16 sec/60 deg
Speed @ 7.4v - 0.13 sec/60 deg
Speed @ 8.4v - 0.11 sec/60 deg
Dimensions: 40.3 x 20.2 x 38.7
Weight: 81g