Geomet Sports (TM) Top Quality Anti-burst Core Strenghthening and Balance Exercise Gym Ball 65 Cm/ 26" Diameter Professoinal grade exercise 65cm stability ball. PUMP NOT INCLUDED Great for core muscle strengthening and balance improvement Can be used with many pilates, yoga and exercise DVD's Great tool for physical therapists and labor coaches and pregnant women Made of extremely durable and latex-free PVC plastic