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The world's first hand-held foam rollers wrapped in patent-pending GRID 3-dimensional surface channels nutrients directly to the tissue for health and mobility. Available in two densities (regular and extra-firm "X"). - Convenient size is perfect for the gym, office or on-the-road - Patent-pending 3-dimensional surface to replicate the feeling of a massage therapist's hand - AcuGRIP handles for targeted relief - Water-resistant - Simple-to-clean - Backed by a one-year warranty Get off the floor! Use the GRID STK or GRID STK X seated or standing to relieve minor aches and pains.