These balloons are easy to use. You can fill them with helium to make them float or with air if you don't need them to float. When using helium, inflate them close to the start of your event so they last through the celebration. They'll float for about 10 - 12 hours. If you use air, they'll stay inflated for 5 - 7 days. Remember, these balloons are a choking hazard for children under 8, so keep uninflated or broken balloons away from them. Always have an adult around when kids are using the balloons. And if a balloon breaks, throw it away right away. These balloons are non - toxic and eco - friendly, so you can use them without worry for your wedding, birthday party, or other events.