Material: nontoxic PVC plastic
[Large] thickened section for adults. Maximum size have， that this is still small， it can not be used arm spare tire， because this is the maximum size of similar products， then great worn on the hand can not swim;
[No.] thicker section for children 15 years of age;
8-15 years in large numbers can be used by inflatable adjustable elastic， free to choose;
[Paragraph] trumpet thickening for children under 5 years old.

Shoot a fat one pair two loaded， beat two made three pairs and threw a small pump