Pro Series Exercise Ball Slow Deflate Yellow 45cm. Iontophoresis Units Access lluvia™ receives sound and digitizes Aluminum band assists in lluvia™ receives sound and digitizes it (breaks the sound waves up into very small density foam * Base: 4 Lb Excellent Retail Packaging * This ball was specially designed to deflate slowly if punctured thereby reducing risk of injury * Provides improved stability at the points of body contact and enhanced performance due to the responsive surface design * Comfortable to sit on * Great grip thanks to built in latitudinal ridges and an outstanding texture that doesn t feel like plastic * Comes with two plugs an inflation adapter a measuring tape to help insure proper inflation and a poster detailing 24 exercises