The GoSports xtreme & strike zone help pitchers visualize with a ‘Player’ in the batter's box. These game changing training aids take seconds to attach, adjust and detach. Use the xtreme & strike zone at home, at practice, or in the bullpen on game day. These pitching aids are a must have for any training regimen. The xtreme are great for baseball or softball training so you can fine-Tune your pitching practice and build confidence on the mound!