Major League Base Foam Plugs with Strong Colored Bristles to Withstand Baseball Infield Drags (5 Colors) Major League Base Foam Plug w/Bristles. Replace old-fashioned base plugs with this highly visible bristles. Bristles allow you to locate base receptacles and withstand overhead pulls of nail drags. Used by Field Maintenance Crews from Little League to High School, College and Professional. Fits all ground female anchors on baseball and softball fields