These are lightweight, perforated training balls that can be used for baseball and golf practice. They are about the size of a golf ball. They are useful in a wide range of situations, such as batting practice, toss batting, and tee batting. Made from a light and easy-to-handle material, they can be used both indoors and outdoors. Their green color provides high visibility, making it easy to keep track of the ball. Practicing with these smaller balls is recommended for improving your ability to hit the sweet spot of the bat, bat control, and overall hitting accuracy. In addition to baseball and golf practice, they can also be safely used for ball games by young children. [Product Details] - Diameter: 42mm - Set of 30 - Color: Green (not luminous) *Ships in simple packaging.