Combat Lisa Fernandez -10 Fastpitch Softball Bat Maximum allowable performance and an ultra soft feel with the industry"s most precise tolerances, thinnest barrels, and Blended Fiber Technology (BFT)--an optimal blending of carbon, glass, and Kevlar fibers. The ultra-light carbon fibers have phenomenal stiffness that is used to optimize the flex and dynamic response of the bats. Strong, yet flexible glass fibers are used to get more trampoline effect out of the bat"s barrel walls without sacrificing durability. Bulletproof Kevlar is used for its incredible toughness and vibration absorbing properties to enhance the soft feel of the bat. Features: The multi-wall construction allows the composite bat maximum performanceThe bat has BFT (blended fiber technology) that allows the bat to reach maximum performancel.20 BPF for USSSA and ASA fastpitch approvedThe barrel is 2 1/4" in diameter