The helium balloon is generally ten inches, and the 2-meter gas model is filled with hydrogen. The price of helium is 20 times that of hydrogen. Helium is an inert gas and there is no danger, while hydrogen is more dangerous. Interior decoration generally uses 10 inch helium balloon. The price of helium varies from place to place. Generally, it is cheaper to go directly to the industrial park to get it. If you ask the wedding company to do it, they will definitely charge some money. The price of a 40-liter bottle of helium gas ranges from 1 1,000 yuan to 1 800 yuan, which is the price of three 9s, and the price of four 9s is higher. I hope I can help you.