- The 2019 Mizuno® B19 PWR Carbon USA Youth Bat features an extended barrel shape with cylinder seaming to seamlessly follow through in the zone. This streamlined one-piece bat is constructed with Black Onyx Carbon™, boasting maximum durability and a shorter break-in period, and is outfitted with a Speed-Helix™ Grip for optimal comfort during various game day conditions.This bat has a balanced Swing weight which is perfect for your all around contact hitter! This bat also features Power ring technology, which means it has a lower barrel compression for bigger impact off the bat!