1. Environmentally friendly material, anti-burst design: This donut ball is made more environmentally friendly, free of BPA and heavy metals and non-latex PVC. The PVC is durable and anti-burst design, very safe.2. Non-slip and portable: The donut exercise ball with anti-slip lines make sitting or exercise much safer. It's lightweight, easy to carry, to take anywhere you want by blowing it off and inflating it with the bellows.3. Improve balance and strength: The inflatable donut ball will improve core strength, balance, coordination and flexibility. It adds instability during exercise to engage stabilizing muscles to increase fitness effectiveness.4. Well-designed, perfect gift: You can use it to lose weight, play with your baby and have happy parent-child time. Specially designed for use with fitness balls to prevent the balance ball from rolling or sliding when sitting or storage. With it, you can sit down or do various balance exercises more confidently.5. Widely Use: It can be used not only as an exercise ball, but also ball armchair in gym, office, home, kindergarten and classroom. Such as pilates, yoga, abs and back training, gymnastics, bodybuilding exercise, core training, balance training, physiotherapy.