Dagu Motor and Encoder Kit for Robotics Projects, Includes Pair of Wheels, Motors, Encoder Kits (RS034)Perfect for any hobbyist or student, this simple motor and encoder kit from DAGU combines low cost, reliable encoders with powerful geared motors and 65mm diameter wheels with soft rubber tires and foam rubber inserts. Includes one pair (left and right). The new geared motors offer two shafts that the magnetic encoder disc can be attached to. When attached to the output shaft the encoder output will change state (high to low or low to high) 8 times