Hudson’s Balance Disc enhances core muscle strength and development by isolating specific muscle groups. Made of soft, pliable PVC with a nibbed surface on one side and flat surface on the other, Hudson’s Balance Disc can be used in tandem with the detachable resistance cables for a variety of exercises such as, standing, sitting, kneeling, and lying down workout routines. Hudson’s Balance Disc measures 13 inches in diameter and 3 inches in height with an anti-burst technology that can withstand 500 lbs. of pressure and can be re-inflated using a standard bicycle pump. Hudson’s Balance Discs are built to last, even under the most strenuous workout routines.