I received this as a prize before, but I'm selling it because I haven't used it. Developed by Kazushi Tezuka of Joutatsuya PROGRESS GEAR - Progress Gear - A gear designed to make a sound only when the arm performs a proper swing! It helps you become aware of pitching and throwing motions that are in line with human anatomy! ＜Features and Expected Effects＞ ■ This "Gyro Stick" is a pitching & throwing adjustment training tool. ■ Use it in your fingertips during shadow pitching or shadow throwing. ■ The feature of the "Gyro Stick" is that "by swinging it in your hand, you can acquire a swing motion that is in line with human anatomy." ■ It is ideal for pitching & throwing adjustments for all positions: pitchers, catchers, infielders, and outfielders, and for players of all ages. ■ By mastering the correct arm swing and release point, you can expect to improve ball control and enhance the sharpness of your pitches. ● Training Gear ● Manufacturer: DESCENTE ● Manufacturer Part Number: C-1000B ● Color: Black (BLK) ● Size: FREE (One Size) ● Materials: Body/Polyurethane, Whistle Part/ABS Resin ● Baseball/Softball Equipment ※This item only, no accessories included. ※Will be shipped in a compact form.