Louisville Slugger I13 Turning Model Hard Maple Wood Baseball Bat. Performance grade hard maple. Baseball’s biggest hitters choose maple for its harder hitting surface and greater durability. Maple is a close-grained timber, which makes it less likely to flake over time. Thanks to maple’s close-grained timber, the bat features a harder hitting surface than ash bats, bringing more power and durability to every swing. Black handlenatural barrel finish. I13 turning model. Approximate -3 length to weight ratio.