Effective January 1, 2018, all leagues governed by USA Baseball will require bats to have a USA Baseball Stamp. AABC, Babe Ruth, Cal Ripken, Dixie Youth, Little League, and Pony baseball all fall under these new rules. All USA approved bats will be stamped with the USA Baseball licensing mark, indicating it is permissible for play in leagues and tournaments under the USA umbrella. Bats marked with the 1.15 BPF stamp will not be legal for play in USA Baseball leagues and organizations, effective January 1, 2018.