This is a set of 30 training balls with holes, perfect for baseball batting practice. They are approximately 72mm in diameter, similar in size to a standard baseball. They are suitable for practical training, such as tee batting, toss batting, and pitching practice. They are lightweight and have a moderate elasticity, making them safe and less likely to cause injury if hit by the body. They don't fly too far, making them suitable for indoor practice in limited spaces. The green color provides high visibility, making them easy to find even during evening or nighttime practice. They can be used both outdoors and indoors. They are widely used, from children's self-practice to club activities, club teams, and recreational baseball. These practice balls prioritize safety and durability. 【Product Details】 ・Contents: 30 balls ・Size: Approximately 72mm in diameter ・Color: Green