Marucci F5 -10 Junior Big Barrel USSSA Baseball BatMarucci F5 10 Junior Big Barrel USSSA Baseball Bat Traditional Feel. Precise Balance. Multi Variable Walls. The F5 Junior Big Barrel bat's one piece alloy design gives youth players the balance, speed, and control to do some heavy damage at the dish. One Piece Alloy Construction: clean, consistent, traditional swing feel Multi Variable Wall Design: expanded sweet spot with high durability Ring Free Barrel Construction: offers greater performance with