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  Ash bats have been preferred because their grain tends to compress and then release, along with the bats themselves flexing slightly. These material properties provide "spring" which helps batters using ash bats to hit balls harder. Less flexible or "springy" woods like hickory or oak are too "dead" to work well as bats. The weakness of ash is that its grains of wood function as something of a naturally-laminated piece of wood. Over time, the grains separate, and the bat comes apart non-catastrophically (flaking) or simply deadens from internal, non-catastrophic fracturing. The bats also fail by shattering, especially when the thin handles are made from wood with a grain that cuts somewhat across the handle. More on this later.