DeMarini CF5 -11 Youth League Baseball Bat with a 2 1/4-Inch Barrel Tri Strut TR3 composite provides strength, stability and consistent performance Two independent walls create a dynamic springboard hitting surface The dual density internal cap is full of load balancing triangles The CF5 -11 is for little league and leagues requiring a 2 1/4-Inch barrel It's the tightest/strongest composite Demarini have developed