Louisville Slugger Z-1000 YB11Z Composite Youth Baseball Bat (31 inches/ 19 ounces) Elite one of a kind maximum performance youth bat at an amazing price. Too hot for play in most youth leagues NOT approved for games sanctioned by Little League or AABC. No little League stamp. Old 1.15 BPF stamp no longer allowed for USSSA as of January 1 2014 Approved for Babe Ruth, Cal Ripken and youth leagues which allow the hotter old style youth composite models. Please double check your league rules to see if they have restriction