**Update 2/18/2011: The DeMarini CF4 has been cleared for Little League play. Read more here.
Little League Baseball placed a moratorium on the use of composite bats effective December 30, 2010. According to Little League Baseball, the ban was a result of “broken in” composite bats exceeding a Bat Performance Factor (BPF) of 1.15.
“The maximum performance standard for non-wood bats in the divisions for 12-year-olds and below is a Bat Performance Factor (BPF) of 1.15. The research found that composite bats, while they may meet the standard when new, can exceed that standard after a break-in process” President and Chief Executive Officer of Little League Baseball and Softball Stephen D. Keener explained.
Much like the composite ban by the National Federation of State High School Associations, bat manufacturers can try to receive a waiver by submitting their bats for further testing. Little League has created a list of approved composite bats and will continue to update the list as more bats get tested. Please check back frequently as this list is sure to grow.
You can browse and purchase Little League Baseball approved bats here:
Little League Baseball Approved Composite Bats