Champion Sports Pitching Machine Softball PITCHING MACHINE BALL WITH DIMPLES: Champion Sports softballs for pitching machines are dimple molded, quality polyurethane plastic balls for player safety during use and increased durability overtime FOR ANY PITCHING MACHINE: The Champion Sports Replacement Pitch Machine Softballs are designed to fit seamlessly with any regulation softball pitch machine so you can keep the device you already have FOR INDOOR OR OUTDOOR USE: The bright yellow coloring and plastic construction of these balls means they can be easily seen whether inside or outside, but are lightweight so they wont cause damage PERFECT 11 or 12 INCH PRACTICE BALLS: The available sizes of these Champion Sports Dimpled Plastic Softballs are the ideal for taking some fast pitch softball batting practice so you're ready for game day IDEAL SPORT TRAINING EQUIPMENT: Both kids and adults will love these lite poly training softballs for hitting practice; one dozen balls for plenty of batting fun at the field or even in your backyard