A variable stiffness striking implement, such as, for example, a ball bat typically used in baseball, softball, or rubber ball. The striking implement, preferably has a separate barrel and handle and includes a variable stiffness assembly which results in the user being able to adjust stiffness. This is accomplished by the user selecting a stiffness member having a desired hardness and inserting the selected stiffness around the handle and abutting the end of the barrel closest to the handle end and using a cap to hold the stiffness member in place, or, if desired by the user, the striking implement may be used without a stiffness member.