Improve posture, build core stability and increase back strength with the STOTT PILATES Power Pack Mini Stability Ball in Blue. This 5-piece set includes a ball, blow-up straw and plug along with a workout DVD and Easy Start poster. A great addition to your arsenal of exercise equipment, this awesome set provides a full-body workout with an emphasis on lengthening, strengthening and enhancing mobility. Lightweight, portable and easy-to-store, this 7-inch ball will enhance any Pilates workout!