Mattingly Sports Youth-13 V-Grip Ripped Baseball Bat Patented V-Grip technology MB5500 Atomic alloy for optimum strength and response Direct Power Transfer - stiff handle design for explosive energy transfer. Tru Balance weighting technology with huge sweet spot. Locked-N-Loaded End Plug II - maximizes trampoline effect. Meets BPF 1.15 Standard. Approved for All Youth Associations. 2 1/4" barrel diameter.