All balloons are standard film balloons with check valve. Insert a thin tube such as a straw and inflate with a balloon pump. It is just the right amount of tightness to leave a little wrinkles on the entire surface. Please note that too much inflation may cause damage. If you inflate it with normal air instead of helium, it will not float, it is recommended to paste it on the wall with double-sided tape. There may be individual differences, but it can be displayed around 1 month. After use, you can insert a straw or other item to deflate. Can be reused by handling carefully when inflating and deflating. Keep out of reach of children. Do not store or use near fire.