This is a set of 30 used Naigai rubber soft baseballs, used for approximately six months at a batting center. Price is firm. - 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) Suitable for practicing a large number of swings, as you wouldn't want to waste 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 surfaces or deformations 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. Since games don't always have perfect bounces, this is practical training. • 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 careful catching with the core of the glove or firmly grasping (re-gripping) with bare hands. 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) before hitting (or letting it pass). • Effect: Trains dynamic visual acuity. By setting rules like "hit if red, pass if blue," you can train quick judgment. 4. Pitching and Throwing Practice (*Caution Required*) • Fingertip Sensitivity Check (Slippery Balls) • Method: Use balls where the seams have almost disappeared. • Practice: Catching practice at close range. • Effect: Since it becomes more difficult to push the ball with your fingertips and apply the correct spin without relying on the seams, you can cultivate fine fingertip sensitivity.