RumbleRoller Beastie Beastie Series products expand the RumbleRoller experience to provide more intense, versatile, portable, and affordable massage options. The Beastie is an aggressive massage ball that is the heart of this series. 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. Uniformly spaced, high-profile bumps for deepest muscle penetration! Available in two firmness levels Optional detachable multi-function base Tactile, high-friction surface for maximizing shear forces Latex-free and phthalate-free Original or X-Firm? The Beastie is available in two versions - Original (clear), which has firm but flexible bumps, and X-Firm (green), which is extremely firm. The best one for you depends on both your sensitivity to pain and your method of use. For example, if you are using the Beastie on the floor and putting your full weight on it, we recommend the Original version. If you are using the Beastie against a wall, you'll be applying much lower forces to it, and will probably respond best to the X-Firm. If you plan to work your entire body and experiment with different techniques, you may want to own both versions. Use of the Detachable Base The detachable base is more than just a place to park your Beastie when you are done using it. It's a fundamental, patent pending part of the Beastie system, and it provides these distinct benefits: Elevation The Base elevates the Beastie an additional 1/2" above the surface, to better access hard-to-reach areas of your body. Intensification The Base orients the Beastie so that one of its bumps is held firmly in a straight-up position. That guarantees maximum penetration of the muscle.