The MG-360 continuous rotation, high torque servo is perfect for driving wheels or tracks of robots. It weighs 56g and has deminsions of 41 mm X 20 mm X 38 mm. Included is mounting hardware and various servo arms.The servos are * from the USA in ESD protective packaging. The MG-360 is a great choice for driving robots using a microcontroller without having to use an H-Bridge or other motor driver board. The servo rotates at full speed CW or CCW. If programming with values used for normal 90° servos, a setting of 90 is 'no movement', a setting less than 45 is movement in the CW direction and a setting of more than 135 will be movement in the CCW direction. There is a sample Test SKETCH on the 'Additional Products' page at americanroboticsupply.com. This new model provides great ramping and speed control. Click our Name to see some of our other products!