The Flex Plus bump hammer is the most flexible tool used to strike the back of a bump key to help ensure a successful bump that we offer.
Whether or not the most flexible hammer is the one which works best is a personal preference; there isn't a "best" bump hammer. Nearly all hammers we offer will do the same thing: help you with bumping a lock.
To give you an idea of how flexible this bump hammer is, one end of the hammer handle can be bent back upon itself end to end. The other hammers we offer do not bend anywhere to this degree.