This mermaid-themed balloon set consists of 18 latex balloons 2 mermaid tail balloons and 2 sea shell balloons. It has a wide range of uses wedding decoration birthday party Christmas and other festive decoration can also be used for children to play as a game reward. Since the aluminum film balloon is not elastic it is recommended to fill it with 80% full gas to prevent the balloon from bursting. If you want the balloon to stay aloft you need to inject nitrogen. Do not allow children under the age of 8 to play with balloons unsupervised.