The Vigor Youth Big Barrel Bat is made with a 1-Piece Design and crafted with 100% Composite material. The Variable Stiffness Profile allows for optimum barrel compression, which is going to maximize your performance with every swing. The Single Wall Barrel on the Vigor is designed to allow fluid energy transfer causing the ball to explode off the sweet spot at impact, adding further distances to your your hits.1-Piece Design100% CompositeLizard Skins Bat GripSingle Wall BarrelPrecision Molding TechnologySeamless ConstructionVariable Stiffness Profile2 5/8" Barrel Diameter-8oz Length to Weight RatioUSSSA 1.15 BPF Stamp of Approval