The Xelerator, Perfect Circle, Wrist Snapper, Spin Right and the Throw Max.
The Throw Max is a device that fits around the elbow to help keep the elbow from being overly used in the pitching motion. Windmill pitching is a true whipping motion. If the pitcher does not employ the wrist and fingers adequately, they will not achieve the speed and control that they may otherwise develop. This is one item that generally will not be included as part of a package. If pitchers have been taught to finish with their elbow high at the end of the pitch, they tend to me more susceptible to elbow pitching. This can be most easily observed by either watching from the side or using a camera from the side.
Package #3 should only be purchased if you have a known problem with elbow pitching.