LITTLE LEAGUE APPROVED. Reduce the risk of serious injury to sliding players with this unique base designed for all ages. According to Rule 1. 06 of the Little League rule book, Beginning in 2008, it has become mandatory that all leagues utilize bases that disengage their anchor. Features: Bases release when the magnetic attraction between the base and magnetic fixture are overcome by excessive force from a short slide. 3 different plate sizes bolt to the bottom of the base pan to adjust the holding strength of the base to the anchor. Base cover has a ribbed surface design to reduce the risk of slipping. Anchors sold separately