Thank you for viewing! I purchased these around the time of the COVID-19 pandemic and used them for indoor batting practice. One is an electric type that can do forward tosses. The second is a mechanical type that can do upward tosses. By practicing with both types of tosses, you can have more effective batting practice. Also, the sponge balls have a core, and they make a "crack" sound when hit cleanly. The balls are made of urethane and sponge, and I'm including 14 balls. The box, bag, and instruction manual for each are included. Also, 3 Evolta batteries are included. You can use them right away! No returns or exchanges, please.