65cm Super Anti-burst Stability Ball (tolerance up to 1200 pounds) is built with a very thick skin so that it won't bleed air or pop if punctured - critical performance characteristics for any Stability Ball used for lifting weights. Ball is an original design and has non-slip surface. Anti-burst Stability Balls are used for hundreds of important core-based lifting exercises (also called proprioceptive lifting exercises). It is the most versatile exercise tool on market and an essential component to exercise programs because its balancing effect maximizes muscle response. This ball is appropriate for use with dumbbells and is especially useful in the home environment. It is probably the single most important core training exercise tool one can have. Dual-action Black 9 inch pump included. SIZE: 65cm (if height is 5'4 to 5'9 choose 65cm; if height is greater than 5'9 choose 75cm). more info