Schutt Hollywood Jack Corbett Pro Bases Schutt Jack CorbettŪ Pro Bases are used by all 30 Major League Baseball teams, and by all six National Pro Fastpitch Softball clubs. Longest lasting pro-style bases available. Tapered lip digs into the dirt, greatly reducing edge turn up. 1200 lbs. of tensile strength helps prevent tears and cuts. Made from highest quality rubber. Features six inch stanchions. Will stand up well under adverse weather conditions. Recommended for advanced levels of play only. Set of three bases.