Green, 55CM URBNFit Exercise Ball - Yoga Ball for Workout Pregnancy Stability - AntiBurst Swiss Balance Ball w/ Pump - Fitness Ball Chair for Office, Home Gym ANTI-BURST - Built with high-quality PVC material, the anti-burst yoga ball can handle the most rigorous workouts up to 600 lbs of weight without you needing to ever worry about the mechanism bursting or the balance ball losing its shape. ANTI-SLIP - The surface of this piece of gym equipment for your home is coated in a non-slip glaze that will ensure you have a proper and safe grip when using it to get fit, relieve back pain, or to soothe aches during pregnancy as a birthing ball. TOTAL FITNESS - Excellent stability ball for pilates and physical therapy. It is a wonderful aid for expectant mothers when used as a birth ball. Beyond those functions, it can help improve posture and core strength as an exercise ball chair.