Remedy 80-YT226 Mobile 360&deg; Swivel Cushion Can be used in a vehicle, in the office, or at home; No installation necessary, simply place on the desired area and use 360 degree swivel action minimizes tension on back, knees hips and sore joints; special anti-slip base helps to keep swivel in place Easily fits almost every seat and leaves nothing behind Dimensions: 16.25 x 16.25 x .75 inches