The FitBALL Seating Disc is an air-filled disc with a unique dome-shaped top that mimics the sensation of sitting on an exercise ball. This versatile disc can be used as a balance disc to improve proprioception or as an active sitting cushion. � Durable and designed for high use settings� Textured surface on one side to increase circulation while seated� Available in adult and junior sizesDownload Chair Accessory Comparison Chart Here