FitBALL Sport Firm Exercise Ball - 65cm Color: Black (SPBALF 65BK) Dimensions: 65 cm Weight Capacity: 1,250 lbs. This more firm version of the FitBALL creates a greater balance challenge and is great for improving flexibility, core and muscle strength, posture, and cardiovascular fitness Made of burst-resistant material that prevents rapid deflation when punctured Requires inflation (pump not included)