Set of 54 plastic balls in various colors, perfect for batting practice. For batting practice. The size is the same as a ping pong ball, but they are more durable than ping pong balls, and the feel and sound when hit are better. Motivation is significantly higher than with the hole-filled type. 8 hole-filled balls are included as a bonus, but the feel and sound were not very good. You can hit them towards the curtains indoors even in the cold winter. My family was hitting them in an 8-tatami mat room. Suitable for elementary school students to high school students, and adults. I've tried various training tools, but this was the most useful. Even mothers can practice with these. Recommended for improving hitting ability and self-training throughout the year. - Colors: Red, white, yellow, and green balls - Quantity: Approximately 50 - Material: Plastic - Usage: Training tools, for batting practice Thank you for viewing.