Miken Rain Light 100 Comp Fastpitch Bat - Women's Brand New Miken MFRL12 Rain Light -12 Fastpitch Softball Bat R900 carbon fiber provides 38.8% higher tensile strength and 40% higher elongation than industry standard carbon fiber. R900 is proven to endure grueling play, deliver unrivaled durability and maximize performance. The MPa7 resin system is exclusively calibrated to optimize the performance and resilience of Miken's premium carbon fiber materials. Biaxial - The Multi-Layer Biaxial Technology precisely aligns and bonds filaments of premium aerospace grade carbon fiber to produce unrivaled durability and performance. DFR 180 - Dynamic Flex Ratio is formulated to maximize performance by producing optimal handle recoil for specific swing speeds. DFR 180 increased handle recoil provides added distance to lower swing speeds.