Servo drive wheel

These two 3d printed wheel parts will mate up with a standard continues rotation servo for robot projects. 4 screws hold the hub cap to the drive wheel and the drive wheel to the servo horn. A 45 mm rubber O ring is snapped in to the slot for traction. I used the wheel for this custom 3d printed robot project that can be seen on you tube..https://www.youtube.com/watch?v=zC0FQ4O-J0c