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Helium balloons are inflatable objects typically made of flexible materials such as latex or Mylar, filled with the lighter-than-air gas helium. These balloons are commonly used for decorative purposes at events such as parties, celebrations, and promotions. Helium balloons come in a variety of shapes, sizes, and colors, and are often adorned with designs or messages. The gas inside the balloon allows it to float in the air, creating a visually appealing and festive atmosphere.