See the current list of approved composite bats: http://www.littleleague.org/learn/equipment/approvedcompbatssmall.htm

See the FAQ on bats: http://www.littleleague.org/media/newsarchive/2010/Sep-Dec/LLBBCompositeBatMoratoriumFAQ.htm

Little League International Issues Update Regarding Composite Bats:
Moratorium Imposed Immediately

SOUTH WILLIAMSPORT, Pa. (Dec. 30, 2010) - Little League International has placed a moratorium on the use of composite bats in the Little League (Majors) Division and all other baseball divisions of Little League, effective immediately.

"Today's decision of the Little League International Board of Directors Executive Committee is based on scientific research data from the University of Massachusetts (Lowell), which was contracted by Little League Baseball," Stephen D. Keener, President and Chief Executive Officer of Little League Baseball and Softball, said. "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."

Local Little Leagues were first informed of the research last September.

"From the beginning, and throughout this process, we wanted to keep everyone informed," Patrick W. Wilson, Vice President of Operations at Little League International, said. "Our intent was to provide local league constituents clear direction regarding composite bats. There is a process through which manufacturers can submit individual models for a possible waiver if they wish to seek it. Going forward, we will let our leagues know which ones meet the standards for the Little League Baseball (Majors) 12-and-under divisions, if any."

On Sept. 1, Little League International placed a moratorium on composite bats in the Junior, Senior, and Big League Baseball Divisions of Little League. Subsequent to that moratorium, some composite bat models have received a waiver and may be used in those divisions. Information on the composite bats that have received waivers for the Junior, Senior, and Big League Baseball Divisions of Little League may be found here:

http://www.littleleague.org/learn/equipment/approvedcompbats.htm

At present, no composite bats for the Little League (Majors) Division and below have received a waiver. If and when any models do receive a waiver, Little League International will inform its leagues of that decision.

The moratorium on composite bats, which now applies to all baseball divisions of Little League, does not apply to any softball divisions of Little League.

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Sincerely,
Little League International

Rookies, Minors, AAA and Majors:

BE SURE THAT THE BAT YOU ARE PURCHASING HAS THIS MARKING:

BPF 1.15

... on the barrel or handle of bat. IF NOT, IT WILL NOT BE ALLOWED FOR PLAY IN LITTLE LEAGUE GAMES.

Juniors:

RE: Moratorium on Composite Bats in the Junior League, Senior League, and Big League Divisions of Baseball

Update: http://www.littleleague.org/media/newsarchive/2010/Sep-Dec/StatementFrom...

At present, the moratorium on composite bats does not apply to the Little League Baseball (Majors) Division and below, nor does it apply to any division of softball.
 
A moratorium on the use of composite bats in the Junior, Senior, and Big League Baseball Divisions of Little League was enacted on Aug. 27, 2010, by the Little League International Board of Directors, effective immediately. The moratorium shall be in effect until further notice by Little League International.
 
The moratorium covers all games and practices only in the three divisions referenced above. It closely follows a similar moratorium approved in July 2010 by the National Federation of High School Associations (NFHS), based on a recommendation from its Baseball Rules Committee. The NFHS Board enacted a rule to prohibit the use of composite bats until they can produce consistent compliance with the standards through the life of the bat.
 
Waivers of the moratorium may be considered by Little League International in certain circumstances. For 2011, a manufacturer may apply for a waiver of the moratorium for a particular model of composite bat if all of the requirements for a waiver, as established by Little League International, are satisfied. Composite bats that are certified by an approved independent testing laboratory as meeting the current Ball Exit Speed Ratio (BESR), and the Accelerated Break-In (ABI) procedure, will be eligible for the waiver in 2011. Little League International will provide a list of bat models, if any, that receive waivers of the moratorium.
 
Not covered under the Little League moratorium are wood bats, metal bats, or bats that have composite materials in the handle only. A composite bat is one that has a metal shell, but a woven composite of fibers on the inside of the barrel portion of the bat.
 
Currently, the moratorium on composite bats does not apply to the Little League Baseball (Majors) Division and below, nor does it apply to any division of softball. Little League International, in consultation with independent experts, anticipates being able to provide local league constituents clear direction regarding composite bats in the Little League Baseball (Majors) 12-and-under divisions, prior to the start of the 2011 season.

Also note: "Beginning January 1, 2012, all bats not made of a single piece of wood
shall meet the Batted Ball Coefficient of Restitution (BBCOR) performance
standard, and such bats shall be labeled with a silkscreen or other
permanent certification mark. The certification mark shall be rectangular, a
minimum of a half-inch on each side and located on the barrel of the bat in
any contrasting color. Aluminum and composite bats shall be labeled as
approved tamper evident, and be marked as to their material makeup being
aluminum or composite. This marking shall be silkscreen or other permanent
certification mark, a minimum of one-half-inch on each side and located on
the barrel of the bat in any contrasting color."