From the rulebook [0]: > The bat shall be a smooth, round stick not more than 2.61 inches in diameter at the thickest part and not more than 42 inches in lengt

From the rulebook [0]: > The bat shall be a smooth, round stick not more than 2.61 inches in diameter at the thickest part and not more than 42 inches in length. The bat shall be one piece of solid wood. [0] https://mktg.mlbstatic.com/mlb/official-information/2025-official-baseball-rules.pdf https://mktg.mlbstatic.com/mlb/official-information/2025-off...