This "Gyro Stick" is a pitching & throwing adjustment training aid. It is held in the fingertips during shadow pitching and shadow swinging. The feature of the "Gyro Stick" is that "by swinging it in your hand, you can acquire a swing motion that is suited to the human body's mechanics." It is ideal for pitching & throwing adjustments for all positions (pitcher, catcher, infielder, outfielder) and players of all ages. For pitchers, it can improve ball control and is expected to enhance the sharpness of the ball. In addition, it is effective not only for gyro balls but also for learning sharp fastballs, sliders, cut balls, etc. Gear for mastering "ideal pitching & throwing." It is designed to make a sound only when the arm passes through the correct swing path. It allows you to be aware of pitching and throwing motions that are in line with the human body's mechanics. Training equipment made by progressGear, featuring a heart-shaped hole. - Brand: progressGear - Model Name: by Tira - Features: Design with a heart-shaped hole - Function: Ball throwing tool - Shape: Slim shape Thank you for viewing.