Stott Pilates Stability Plus Ball with Pump Available in 3 sizes: 55cm (22) Stability Ball is ideal for those under 170cm (5'7&quot;) tall, 65cm (26) Stability Ball is ideal for those under 170 - 185cm (5'7&quot;  61) tall , 75cm (29) Stability Ball is ideal for those taller than 185cm (62). Sold individually. Focus on increasing core stability while challenging the deepest stabilizing muscles in the body The ultra-durable, anti-burst STOTT PILATES Stability Ball has a non-slip, polyvinyl ribbed surface and is latex-free Hand pump Included Also available in a value Power Pack, STOTT PILATES Stability Ball Power Pack