Eccentric Vectored Intake Wheel
These wheels work well for drawing balls towards the center then up over a bumper. In the video below, a line of left handed wheels meet up with two right handed wheels. Notice how the ball traverses to the left, then up and over when it reaches the right handed wheels. Sold in a set of one left and one right handed intake wheel. The assembly in the picture has many sets. The hub is 1/2" hex bore and 3/4" wide. The wheels sweep a 1.75" circle when spinning. The weight of each wheel is 29g(0.064lb).
Eccentric Vectored Intake Wheel Movie