The term Louisville Slugger Material is referring to the type of wood used to make baseball bats. The crossword solution for this term is 'ASH', which is a type of hardwood that is often used in the production of baseball bats. Louisville Slugger is a brand of baseball bats that has been around since 1884 and is known for its quality and durability. The company uses ASH as its primary material for making bats, as it is strong and lightweight.