RED BALL (Red Ball) is a pitching practice ball. You can practice breaking balls by inserting and removing the pins attached to the special ball. As a bonus, we will include a guidebook printed by us that describes variations of how to throw breaking balls. The guidebook explains how to throw a two-seam fastball, four-seam fastball, curveball, knuckleball, split-finger fastball, changeup, slider, knuckle curve, drop, and screwball. This is a useful item for baseball pitching practice. [Brand] RED BALL [Category] Baseball training equipment [Color] Red系 (Red-based) [Contents] Pitching practice ball, bonus guidebook Everything in the image is included. Thank you.