The Xtra Fielder Strike Zone PRO for Wiffle Ball is a high quality, all in one unit, that acts as an umpire, catcher, and backstop. No more arguing over balls and strikes, If the ball goes in the net, it is a strike! Plus it acts as a catcher and backstop and limits the numbers of trips needed to retrieve balls. High quality, made in the USA. Portable. Includes 1 Official Wiffle Ball and Bat. Plus includes directions on how to make stands for use of this strike zone indoors or on hard surfaces Everything you need to play Wiffle Ball indoors or outdoors!