Size:4 PackSpecification: Brand new Material: Metal Color: Black Stall Torque: 13 kg / cm Operating Voltage: 4.8 - 7.2V Steering Angle: 0-360° Feature: Metal gear and double ball bearing. High speed, stable and shock proof. Fine workmanship and good performance. Easy to use. Long service life. Compatible with most standard receiver connector Package included: 4 x RC Servo Motor kit.