Champion Sports Plastic Baseball LIGHTWEIGHT, PLASTIC CONSTRUCTION: Designed with a hollow construction, these plastic practice baseballs are a lightweight alternative to standard baseballs or softballs, making them great for batting practice and safe for all ages to play indoors. DESIGNED FOR PRACTICE: Made to be lightweight and easy to control, these plastic baseballs are designed for batters to work on their hand-eye coordination or pitchers to practice their form and increase their precision on curveballs or sliders. 9 INCH CIRCUMFERENCE: These practice baseballs are the same size as a standard baseball, allowing players to practice their batting and catching in a real-game environment with standard sized equipment, improving their in-game performance. DURABLE AND VERSATILE: Made from a durable plastic with force-reducing holes and a hollow design, these practice baseballs are sure to hold up to heavy swings from batters, allowing players to practice for hours without damaging the balls. INDOOR OR OUTDOOR USE: Strong and durable, these lightweight plastic baseballs are a great option for practicing swings and playing catch indoors, and the plastic construction makes them easy to clean after use in rain, sand, mud.