High speed, stable and shock proof. Metal gear and double ball bearing Colour: Black Stall Torque: 13 kg / cm (4.8V), 15 kg / cm (6.0V). Operating Speed: 0.17 sec/60¡ã (4.8V no load), 0.14 sec / 60¡ã (6.0V no load) Operating voltage: 4.8 - 7.2V. Dimension: 40mm x 19mm x 43mm. Package Contents: 1x Steering gear with accessories Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.