ProMounds Fiberglass Baseball & Softball Pitching mound is made with high quality fiberglass, creating a top-of-the-line mound that is made to last. The mound offers unique flexibility for both softball and baseball teams. It can act as a game mound for softball and a premium option for tee-ball or coach pitch baseball leagues. The hollow undercarriage can go over any preexisting pitching rubber or be buried in the dirt to create a level pitching service. (MP2010)