New Mizuno B19 Hot Metal BBCOR Baseball Bat 3 2 5 8" Senior Featuring the iST Xs Technology Navy Violet Featuring the iST Xs Technology that implements an extra stiff connection and the TRU3 Technology Connection Piece that eliminates vibration in the hands 6 is the workhorse of the line higher performance Optimized end cap: actually widens sweet spot & creates booming sound Speed helix grip: designed to provide comfort and durability 3 Length To Weight Ratio BBCOR 2 5 8" BArrel Diameter One Piece Alloy which leads to more pop and distance without sacrificing durability Cortech design: wall thickness is adjusted across the barrel to create a massive sweet spot 1 piece design: less flex