The Super Pinky Ball is a simple, portable and effective massage aid for the feet, hands or body. The ball features a firm density for a tremendous self-massage of tired feet, sore hands and tense muscles. It can also help with the prevention or relief of plantar fasciitis by stretching the plantar fascia. Measures 2.5 in diameter. No inflation required. Contains latex. OPTP Super Pinky Ball Massage Ball for Plantar Fasciitis and Sore Muscles