Whether you call it a stability ball, a Swiss ball, a yoga ball, or a birthing ball, our Skelcore 65cm exercise ball with pump supports the weight of your moving body, retains air, and deflates slowly if punctured. You'll love lying on, bouncing, rolling, or lifting Skelcore's workout ball. * Diameter: 65cm (25.6") * Includes 10" hand air pump * Anti-burst material, if punctured the ball will slowly deflate * Hypoallergenic material * Non-slip surface * Support up to 330LBS (150KGS)