Rawlings VELO End-Load BBCOR Adult Baseball Bat BBRVE (-3) (34 inch/31 ounce) Certified: BBCOR Composite end cap with 36% more carbon fibers that lowers MOI and increases swing speed Precision-Optimized Performance Barrel Technology for championship performance levels due to superior balance and swing speed -3 Weight Differential Endloaded for extra power through the zone.