Supports the legs and relieves pressure on the lower back, while increasing healthful circulation. Non-skid strips on one side, and a combined wooden ball massager/non-skid surface on the other side. Smooth, ball bearing roller design encourages gentle rocking of the feet, utilizing most of the lower leg muscles. Solid hardwood platform with injection-molded side frames. Reversible platform glides smoothly along frame with slight pressure from the feet. Nylon wheels and ball bearing rollers provide a smooth rocking motion. Powder-coated steel frame with rubber rests keeps the unit from slipping on hard surfaces. Easily height adjustable. Turn the knob to raise the feet 3-3/4 inches to 6-3/4 inches (9.5 to 17cm) off the floor. Foot rest measures 16 inches x 11-7/8 inches (41 x 30cm). Massage area measures 5 inches x 6 inches (13 x 15cm). Available in two hardwood shades: natural or dark cherry.