This is the Savox SB-2291SG Monster High Speed Brushless Servo, Black Edition, 0.05sec / 250oz @ 7.4V
The newest member of the Savox Monster Series family delivers an impressively quick 0.05 second transit time while producing above-average torque for specific applications where response time is the primary concern.
Models like 1/8 on-road cars, 1/10 nitro touring and even 1/8 EP and GP buggies can improve performance with a more responsive servo-and the SB2291SG fills the need perfectly. Features Savox' patented brushless servo motor technology that provides up to 35% more power than motors in competing brands, while smoothness and reliability are optimized through the use of three precision ball bearings.
Features
Specifications
Torque @ 7.4v: 18kg / 250oz-in
Speed @ 7.4v: 0.05 sec / 60deg
Dimensions L x W x H (mm): 40.3 x 20.2 x 38.7
Weight: 79g / 3.1oz