What's in a Bat? (IMAGE) Brown University Caption Many young baseball players use bats made from something other than wood. These bats are tightly regulated in high school and college. A new study of bat performance in the hands of younger teens will inform bat rules for that age group. Credit Mike Cohea/Brown University Usage Restrictions with credit License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.