New Mizuno 340451 Silhouette 13 Fastpitch Softball Bat White Blue Black 29 16:White Blue Black and an extra long barrel with Black Gold Gray and an extra long barrel with a massive sweet spot Worth has achieved maximum performance while optimizing swing weight and maximizing durability ISF approved Zone: creates a massive sweet spot by adjusting composite angles in 10 specific zones across the barrel Double wall: gives you higher peak performance right out of the wrapper with a larger sweet spot for more power and forgiveness 2 piece link: significantly reduces vibrations to the hands to give you the amazing feel of solid contact every at bat Cylinder seaming: allows for consistent performance and durability across the barrel ASA