A balloon is a container of flexible material usually filled with air or helium, often used as a toy for children. They also serve as decoration for birthdays and other celebrations. Balloons also a good advertising medium, power screen printed in various colors, serving as a memorial or reminder of events or brands business. They are usually made of rubber or aluminized plastic. They come in a variety of sizes and shapes but are more commonly 10 to 30 centimeters in diameter. The balloon can be filled with air by blowing to lung or with helium, in which case it is necessary to use a specific inflator. These last ones are the favorites of the little ones, when raising in the air and to be able to carry them with a string, to release them, to let them float in the room, etc.