Happy Birthday Balloons Banner,Foil Balloons Letters Balloons Mylar Balloons for Birthday Party Decoration-Golf 17 inch balloons made of high quality aluminum foil balloons and auto-seal,includes 13 independent alphabet letters, can be freely taped to the wall Please inflate the gas slowly until 80% filled and keep away from fire, because of the thermal expansion the material is the aluminum film, the ball has the metal luster, the color is even, the ball is beautiful automatic sealing: easy blowing, easy sealing, the balloon can be used repeatedly Used for wedding arrangements , party celebration decoration, children's toys and other purposes. The most ideal decorative balloon of celebration, cooperate with other balloon to use happy effect is better.