The 2021 Rawlings 5150 Alloy 2 5/8" (-10) USA Youth Baseball Bat is made of 100% composite material, which makes it ultra-lightweight for faster swing speeds and enhanced trampoline for increased pop. The 2 5/8” big barrel design, creates a massive sweet spot, making contact easier than ever. This -10 drop weight bat is designed for players ages 12 and under looking to catch up to faster pitches and improve contact rates from the very first swing. this bat is made of Rawlings' 5150 Alloy - their most radically responsive, aerospace-grade alloy built for performance and durability. This bat is fully approved for use in all USA Baseball sanctioned baseball leagues.