This waterproof, steel-geared servo is perfect for monster truck and most scaler and crawler applications where a slightly taller servo can be fitted. Precision steel gears, stump-pulling torque, and waterproof to ip67 standards (operates for up to 30 minutes in water up to 3 feet deep). ""plus"" series servos feature soft start and sanwa ssr compatibility. Features: center aluminum with nylon composite top and bottom case operates directly on 7. 4v without the need for an external bec precision ball bearings specifications: torque @ 7. 4v - 38. 0 kg/527. 7 oz-in speed @ 7. 4v - 0. 16 sec/60 deg weight: 83g / 3. 27oz dimensions l x w x h (mm): 40. 6 x 20. 7 x 46. 1 (sav-sw1213sg)