This is a set of 30 used Naigai rubber soft baseballs, used for approximately six months at a batting center. - Color: White - Type: Soft baseball - Quantity: 30 We propose practice methods that utilize the characteristics of these balls, which have fewer seams. ① Batting Practice (Strengthening Number of Swings and Impact) These are suitable for practice where you want to hit a large number of balls, as you don't have to worry about using new balls. • Continuous Tee Hitting • Effect: Utilizing the advantage of being able to use a large quantity without worrying about damage, this is used for stamina training, hitting hundreds of balls rhythmically. ② Fielding Practice (Irregularities and Handling) • Irregular Bounce Knock • Reason: Balls with worn or deformed surfaces will have irregular spin and bounces. • Practice: Hit strong ground balls on a dirt field. • Effect: Develops "reaction speed" to unexpected bounces and "concentration" to watch the ball until the last moment. This is practical training because games don't always have perfect bounces. • Wall Ball (Handling) • Practice: Throw the ball against a concrete wall and catch the rebound. • Effect: Using balls with worn seams that are slippery requires carefulness in catching the ball firmly with the core of the glove or gripping it firmly with bare hands (re-gripping). ③ Strengthening Dynamic Visual Acuity and Judgment (DIY Modification) Taking advantage of the fact that it doesn't matter if the balls are dirty, modify them with a marker. • Color Balls/Number Balls • Method: Paint the balls with colors like red and blue, or write large numbers (1, 2, 3...). • Practice: The batter calls out the color or number of the ball thrown by the pitcher (or batting pitcher) instantly before hitting (or letting it pass). • Effect: Trains dynamic visual acuity. By setting rules like "hit if red, pass if blue," you can train instant judgment. 4. Pitching and Throwing Practice (※Caution Required) • Fingertip Sensitivity Check (Slippery Balls) • Method: Use balls where the seams have almost disappeared. • Practice: Catch ball at close range. • Effect: You can cultivate the subtle sensation of your fingertips because it increases the difficulty of feeling the ball with your fingertips without relying on the seams and applying the correct spin.