RioRand SG90 9G micro small servo motor RC Robot Helicopter for Airplane Boat Controls (5pcs) Powered by RioRand Advanced Technology Dimensions: 22*11.5*27mm Dimensions: 22*11.5*27mm Operating Speed (4.8V no load): 0.12sec/60 degrees Operating Speed (4.8V no load): 0.12sec/60 degrees