This is a Traxxas 2018 Plastic Gear Standard Servo. This servo is used in a variety of Traxxas models, including the Villain EX boat, Stampede, Rustler, Jato, T-Maxx and Revo trucks, as well as the Nitro 4-Tec.

Specifications:
Length: 1.59"
Width: 0.77"
Height: 1.58"
Torque: 42.0 oz-in
Transit Time: 0.22 seconds/60°
Weight: 1.5 oz