Weighted baseballs add variety and complexity to your baseball or softball hitting practice to amp up your results. Choose a 3 pack or 6 pack of Tanner soft rubber, sand filled weighted baseballs. (Sometimes known as a plyo ball or plyocare weighted ball.) Choose the weighted ball weight that works best for your training goals. 5 Oz. 9 Oz. 12 Oz. 15 Oz. A rubber weighted ball or plyo ball can be used for front toss, flips, batting tee training, and arm care routines. Weighted ball training forces the hitter to focus on delivering a powerful, accurate, on-plane swing in order to "get it right." Weighted baseballs for hitting are a great way to warm up and practice hitting.