Callaway big bertha os irons steel shaft
Big bertha os irons promote more distance in an entirely new way led by extraordinary light and strong exo cage that allows us to strategically position weight to increase forgiveness and helps our industry leading next generation 360 face cup produce even faster ball speeds and more distance features detailsmore forgiveness and ball speed from new exo cage technologythe uniquely light and strong design of the exo cage allows more weight to be positioned in strategic locations to increase