Marucci Cat7 Connect BBCOR Baseball Bat Az4x alloy 2 5/8 inch diameter barrel provides increased strength and a higher response rate. Bbcor Certified More responsive, optimized barrel design creates a sweet spot twice as large as the Cat6 Two-piece Hybrid construction features a carbon composite handle with az4x alloy barrel Sdx: shock dissipation connection Technology dismisses vibrations, providing a smooth, solid feeling at contact Power-balanced barrel provides the optimal combination of weight and balance for effortless power