I'm selling this because I no longer need it. Right-handed pitcher with a top speed of 149 km/h "Developed by baseball influencer Riki Maezawa" Introducing throwing level-up gear to learn efficient throwing techniques!! "I don't want to play catch without doing this practice. It's that important!" This helps you naturally learn how to throw using your core (trunk) strength efficiently while reducing the strain on your elbow and shoulder. As a result, you can prevent injuries while improving speed and control. ■ Size: Diameter 178mm ■ Material: Rubber ■ Weight: Standard / 280-320g ■ Country of Origin: China ■ Features: ・ Size and weight suitable for improving core-driven throwing ・ Includes lines to check the axis of ball rotation ・ Features slits to help you focus on how to grip the ball ■ Practice Method: The guideline is to throw about 10-20 balls per practice session. It's effective to do it at any time, but it's especially recommended to incorporate it into your pre-catch ball warm-up. ■ Target: Effective for all players who have throwing problems, from top-level players to elementary school players who haven't developed their form yet. ※ When elementary school players use it, please be careful not to use it with a sidearm throwing motion with the elbow lowered. I will ship it deflated.