This is the absolute best teaching tool and is a must for all pitchers whether beginning or advanced.  Developed by Cheri Kempf of Club K, the disc provides instant feedback to the pitcher and instructor.  Two things make a pitch move:  direction of spin and the speed of that spin.  The Spin Right lets you work on both.  Grip it one way to work on proper topspin, backspin or sidespin, depending on the pitch.  Grip it another way to work on the speed of the spin.  It comes with a booklet demonstrating the different pitches and overhand techniques.  I use it 4 ways: 
- self tosses
- 10 feet away doing half tosses to catcher
- from the knee drill position 25 feet from the catcher
- full motion from the full distance.

"My daughter had a bad habit of putting a bullet spin on the ball and could not break it until we used the Spin Right Spinner.  In less than two days of practice, we had it under control.  The Spin Right Spinner worked where no other tool did!