Louisville Slugger 2014 SL Attack (-8) Baseball Bat, 28-Inch/20-Ounce 8 length to weight ratio 2-5/8" barrel diameter The first ever 3-Piece Pure 360 Composite construction provides thinner walls for more pop and less weight Patented Tru3 Technology provides maximum trampoline effect and sting elimination USSSA 1.15 BPF certified