Good Quality Yoga Pilates ball consists of honeycomb structure and is covered with a coating, smooth but non-slip. These make balls more durable, sturdy and effectively anti-burst. Multiple Benefits: Small exercise ball is intended for core strength, balance, flexibility, Physical Therapy and for toning and sculpting with Pilates, Yoga or other fitness exercises. Easy to Inflate and Carry The anti-burst balls do not include a valve, but rather have a plug to withstand high pressure. This requires a straw for inflation, and is easy to inflate. Eco-friendly and Skin-friendly Mini yoga ball manufactured from good-quality soft PVC, that is free of harmful substances, eco-friendly and skin-friendly.