The Orb Extreme Mini features a high-density non-toxic, latex-free, EVA/Polyolefin foam construction and firm ridges with a 3" diameter (vs. 4.5”). This smaller size enables the massaging ball to provide more aggressive, single-point myofascial release to a target zone (calves, hamstrings, quads, IT band, etc.) The ball’s 360-degree maneuverability also enables the user to focus the treatment evenly across a treated area.