Made from thickened environmentally friendly PVC material, these tubes are comfortable for all ages. Product material: PVC. Product size: A: 53cm/20.87in outer diameter before inflation, 18cm/7.09in inner diameter; 50cm/19.69in outer diameter after inflation, 22cm/8.66in inner diameter. B: 63cm/24.80in outer diameter before inflation, 21cm/8.27in inner diameter; 58cm/22.83in outer diameter after inflation, 26cm/10.24in inner diameter. C: 73cm/28.74in outer diameter before inflation, 25cm/9.84in inner diameter; 66cm/25.98in outer diameter after inflation, 30cm/11.81in inner diameter. D: 83cm/32.68in outer diameter before inflation, 29cm/11.42in inner diameter; After inflation, the outer diameter is 75cm/29.53in, and the inner diameter is 35cm/13.78in. Recommended age (weight): A: Suitable for 2-4 years old (10-25 kg). B: Suitable for 5-9 years old (20-35 kg). C: Suitable for 10-15 years old (35-45 kg). D: Suitable for over 16 years old (47.5-75 kg). No Damage to Skin: Especially suitable for delicate children's skin, this swim ring ensures a gentle and nourishing experience with its thickened environmentally friendly PVC material. Safe and Sound Swim Support: Designed with children's safety in mind, assuring a safe swimming experience, this bright-colored swim ring keeps the body partially immersed and easily visible. Suitable for Everyone: Catering to various age groups, numerous size options are offered to cater to diverse needs, assuring a fine fit for all family members during pool or beach outings. Lively and Cute Design: Featuring a retro circular stripe pattern and bright colors that captivate, this lively and cute designed swim ring lets children enjoy nonstop joy in the water, with colors that remain vibrant. Easy Inflation Control: Maintain safe inflation standards at 90 percent, utilize the built-in valve baffle to minimize the risk of air leaks and assure optimal performance.