Great value micro DIGITAL tail servo and well suited for the SR belt mod, and other micro helicopters. Horns and screws included. Specs: Model: Digital DS65HB Type: Digital Voltage: 4.8~6v Speed @ 4.8V: 0.09sec Speed @ 6V: 0.07sec Torque @ 4.8V: 1.3kg/cm Torque @ 6V: 1.5kg/cm Gear type: Plastic Weight: 6.5g Size: 20.8x11x20mm