Features & details 60% Cotton, 40% Polyester Imported CORE & BACK PAIN RELIEF: Balance ball features a center cradle for maximum comfort & support IMPROVE BALANCE: Kit helps to improve balance, align and maintain proper form during core exercises STRENGTHEN CORE: Back care kit strengthens core muscles for flat abs and a strong back TONE LOWER BODY: Tone, tighten and firm hips, thighs and glutes EXERCISES INCLUDED: Two 10-Minute Workouts + Bonus Abs Workout (Packaging may vary to include DVD or Digital Download) Unique peanut-shape supports the spine and lower legs Stretch and strengthen your spine, alleviate back pain Helps you increase range of motion, and correct posture and form Anti-Burst CoreFit Ab Ball is free of the most harmful phthalates Includes training DVD with two workouts and one stretching routine