ProSource Core Balance Disc Trainer, 14&rdquo; Diameter with Pump for Improving Posture, Fitness, Stability IMPROVE CORE STRENGTH & BALANCE  Strengthens and engages multiple core muscles at once to maintain balance during exercises MULTIPURPOSE - Can be used for working out or as a seat cushion to improve pos-ture and balance, rather than using a stability ball DUAL-TEXTURED SURFACE - ensures a non-slip grip, with raised massaging bumps on one side and smoother bumps on the other HAND PUMP - Comes with a free hand pump to easily inflate and deflate to your preferred level of firmness PORTABLE - Easy to transport for fitness on-the-go. Dimensions: 14 diameter, 3 height; Weight: 2.2 lbs; Made of PVC