Burst Resistant! Superb Quality exercise ball, made of unique material that are burst resistant. This offers a new level of safety when using the balls. All balls come DVD, air pump for inflation and Poster . PVC burst resistant vinyl exercise balls Tough, thick burst resistant skin (material) resists puncture and pressure leaks Great ab workout, 30% more effective than floor sit-ups Non-impact, total body workout, with adjustable air for increased or decreased exercise intensity Perfect for all ages and fitness levels Work several muscle groups simultaneously and improve posture and flexibility Perfect for yoga and fitness centers Easy to maintain and clean Burst Resistant! Includes Air Pump Includes Exercise Wall Chart Included DVD Yellow 55cm WEIGHT: 5 Lbs