THE GREEN EASTON IS BACK! First introduced in 1978, the original B5 Pro Big Barrel bat boasted the largest barrel aluminum bat ever made to that point in time for a larger sweet spot. And after 40 years in the making, all of Easton’s innovations have produced a new breakthrough worthy of the B5 Pro Big Barrel name. The new B5 Pro features a ringless barrel with varying wall thicknesses. This premium Advanced Thermal Alloy Construction (ATAC) produces a bigger sweet spot and smoother feel for B5 Pro than any other bat of its kind.