This seat cushion stimulates sensory awareness, moderates the wiggles, and provides a soothing place to sit. This disc mimics the movement and shape of an Inflatable ball when used on any seat. Use it on the floor as a standing disc for balance training, proprioception and strengthening of the lower extremities. Each disc has one nubby side for tactile feedback and stimulation, and one flat side. Disc inflates and deflates with standard pump (not included).Colors to choose from: Black, Blue, Green, Red and Yellow.