Beastie Hook Beastie Series products expand the RumbleRoller experience to provide more intense, versatile, portable, and affordable massage options. Beasties Series products do not replace the RumbleRoller, but they are more specific in purpose. Use them to dig deeper into a troublesome area, or to work with greater detail on smaller muscles - e.g. those of the forearms and calves. The Beastie Hook was created to conveniently massage your upper back, shoulders, neck and other difficult-to-reach body parts.