The 5150 USSSA bat is made of 5150 Alloy - our most radically responsive, aerospace-grade alloy built for performance and durability which also makes it ultra-lightweight for faster swing speeds and enhanced trampoline for increased pop. The 2 5/8 barrel design, creates a massive sweet spot, making contact easier than ever. This -11 drop weight bat is designed for T Ball players looking to improve contact rates from the very first swing. This bat is approved for all USA Baseball leagues