2016 AXE Elite Youth Alloy Baseball Bat: L134D 2 1/4 Inch Barrel Diameter -12 Length to Weight Ratio AXE Grip - Ergonomically Designed for Better Control, Bat Speed, Comfort, and Safety Features USSSA BPF 1.15 Certification Flex Handle - Flex-Tuned Composite Handle Maximizes Whip for Greater Bat Speed