Reliable quality: these 4D birthday balloons are made of quality aluminum foil with colorful patterns, thick and auto-sealing to avoid leaks, lasting for weeks after inflation; There is a little hole on the top of the balloon to hang anywhere for your convenience Easy to use: these 4D birthday balloons can be filled with air or helium, easy and convenient to inflate and deflate; Flatten the inflation inlet after the inflation is done, the air outlet will be automatically sealed by its self adhesive glue of the balloons inlets; The happy birthday balloons are reusable Gifts hiding: When you are shopping for a nice birthday party present, you might look for adorable accessories to add to the package; This birthday party balloon will add a bit of joy to your ready present, and give a big surprise to the gift receiver