MIKEN SLRZ10 RZR Senior -10 Baseball Bat 18 oz. 28/18 Brand New Miken RZR Senior -10 Baseball Bat E-FLEX 700 Miken's strongest alloy that allows for thinner walls to maximize barrel flex and performance. Optimizing Barrel Flex results in a massive sweetspot and maximum performance 2 3/4 Barrel Diameter Length/Weight: 28/18