SKLZ Premium Impact Limited-Flight Training Baseballs, Perfect for Adding Power to Swing, Use Indoors Or Outdoors for Practice and Drills, Baseball, Softball, and Mini Balls, Yellow/Black6 pack of limited flight, high impact training baseballs for adding power to swing; use indoors or outdoors for practice and drills Ball weight and density allow for a true flight path and provide instant feedback, yet are safe and wont hurt on contact Official baseball size with exterior texture for more accurate throwing; limited flight capabilities make for easy retrieval High visibility color for tracking ball flight and improving hand eye