The GRID STK is an innovation in hand-held foam rollers.Specifically designed with GRID surface and AcuGRIP handles toroll, release and relieve minor aches and pains.<br><br>The worldu2019s first hand-held foam rollers wrapped in patent-pendingGRID 3-dimensional surface channels nutrients directly to thetissue for health and mobility. Available in two densities (regularand extra-firm u201cXu201d).<br><br>Get off the floor! Use the GRID STK seated or standing to relieveminor aches and pains.