This 4-in-1 bundle from Pilates On Fifth includes all the accessories for your Pilates and Yoga workout needs: - Stability Ball (PUMP Included) - Long Stretch Band - Small Ball - Two Massage Balls. The stability ball adds (ironically) instability, which translates into A LOT of core involvement in each and every exercise.  And guess what? Even when you're not exercising, you can use the stability ball in place of your favorite chair!  (What better way to work your core more?)  The massage balls are EXCELLENT for spot-relieving tension in cranky muscles:  hamstrings, calves, upper back, and hips.  Color options! ALL PURPLE! SILVER AND BLUE!