DeMarini CF5 -8 Senior League Baseball Bat with a 2 5/8-Inch Barrel Tri Strut TR3 Composite Barrel  Tri Strut TR3 Composite provides strength, stability and consistent performance through triangular formations at the molecular level. TR3 creates a very strong and responsive barrel without any unnecessary weight. DoubleWall Barrel Construction  Two independent walls create a dynamic springboard hitting surface giving you a sweet spot with ball-popping trampoline effect. Tri Strut TR3 Handle Its the tightest/strongest composite DeMarini have developed. Gaining strength through triangular formations at the molecular level it efficiently transitions power from your hands to the barrel giving you balance and consistency. Geo Endcap  The dual density internal cap is full of load balancing triangles. Its designed to maintain the stiffness of the barrel while dampening impact vibration to give you amazing feel, shot after shot. The CF5 -8 is for senior youth big barrel and travel leagues