Must have "USSSA 1.15 BPF (Bat Performance Factor)" stamp OR "USA" Stamp
15U A/AA 2 3/4 inch max diameter, max -10 weight to length ratio, composite, aluminum or wood combination
15U AAA -10 max length/weight drop, Wood, Bamboo or Wood Composite
18U AA -3 max length/weight drop, and marked “BBCOR"
18U AAA/College Prep Wood, Bamboo or Wood Composite