Professional grade durable material: using thick PVC material, safe and environmentally friendly without odor, matte design, non-slip and durable.^ Balance and fitness: through sitting or lying posture adjustment, improve your balance, and then play a fitness effect can do Inflatable Donut Balls improve core strength, balance, coordination, and flexibility.^ Strong Pressure Capacity: to ensure your safety when using, safe and reliable, you can use with confidence.^ Well-designed: Designed specifically for use with fitness balls to prevent the balance ball from rolling or sliding when sitting or storing. With , you can sit down or do various balance exercises more confidently.^ Stable: The equipment is stable and allows for an intense high caliber workout at home and even the overall calming workouts of yoga.