13U Bat Standard Changes Starting January 1, 2020, our 13U division will have a new bat limit. A maximum of drop 8 (-8) will be the new bat restriction for the 13U age group. This will only apply to 13u events and teams playing in 13U events. See USSSA rule below. Effective January 1st 2020, all 13U events and all teams in 13u events must use a maximum drop 8 (-8) bat with the official USSSA 1.15 BPF Mark permanently stamped. All 14u events and all teams in the 14u event must