Editorial Reviews:
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* Anti-burst, can withstand 500 pounds of pressure, and can be re-inflated using standard bicycle pump and pump adapter * Enhances core muscle strength and development by isolating specific muscle groups * Can be used standing, sitting, kneeling, lying down, and in tandem with exercise equipment such as balls or resistance cables * Made of soft, pliable PVC with a nibbed surface on one side, and a smooth surface on the other * 13 inches in diameter and 3 inches in height
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