Mizuno 340251 MaxCor Adult BBCOR Baseball Bat (34-inch-31-oz) : The Mizuno MaxCor Baseball Bat is a power hitters dream! Made for distance - the patented V.P. sleeve increases the spin rate velocity for every ball off the bat - carrying each hit faster and farther than ever before. The hitting surface creates a wider circumferential sweet spot area. Aerospace grade aluminum alloy core is used to strengthen the bat while the Dynamic Damper transition piece from barrel to taper absorbs vibration for a better feel.