Nova exercise balls are an expertly designed set of three different exercise balls to perform kegel ball exercises with. Each ball is equipped with a silicone string to easily take out the ball after use. The entire Nova ball is made of body-safe silicone which is 100% waterproof. According to the kegel exercise theory, we designed these kegel exercise courses especially to help those who want to tighten their vagina muscles after giving birth.The set of Nova balls has three gradual increased weights for different exercise needs. Effective kegel exercise helps to strengthen a womans PC muscle, pubococcygeus muscle, improving vaginal health while bringing sexual benefits and satisfaction. For daily exercise or postpartum recovery, Nova exercise balls are the perfect choice for your PC muscle strengthening needs.Product FeaturesFully covered with soft siliconeFully submergible 100% waterproofThree different weightsSilicone string for easy removalEnvironmentally friendly materialSpecificationsMaterial Body-safe siliconeSingle Ball Dimension 36X135 mmDouble Ball Dimension 32X170 mmDouble Ball Dimension 28X162 mmWeight 49g, 75g, 95gWater Repellency 100% waterproof