Rawlings Sporting Goods Big Stick Joe Mauer Flame Treated Birch Wood Bat This Joe Mauer Big Stick bat features a Flame Treated Birch wood and a ultra thin tac-grip for an enhanced feel. The Big Stick Series is designed for players who can swing with a heavier barrel. With a larger hitting surface and increased sweet spot, the Big Stick wood bats are in a league of their own.