SPRI Pilates Power Ring and DVD For abdominal exercises focusing on strength, balance, flexibility and posture Fully cushioned Power Ring and video training session are suitable for all levels of users Pilates method of exercise is one of the fastest growing exercise disciplines across the country Dimensions 15 x 15 x 2.5 (W x L x D); weighs 1.7 pounds Kit includes 14-inch Power Ring and a workout DVD featuring Melissa Walker