Giant Black 40 Foil Balloon for 40th Birthday, Anniversary, or Party Decor

40 balloons, Black number 40 foil mylar balloon 40 inch number balloons, Large number 40 balloons is for 40th birthday anniversary party decorations.
Number 40 Mylar Balloon, Material: foil membrane Jumbo foil balloon 40 balloons,made of high-quality aluminum film.Please use the straw in the balloon set to inflate it slowly.
2 Pieces 40 Inch Black number balloons:No.4 Black number balloon + No.0 Black balloon .
Please avoid filling more than 90% of air or helium.If it is over-inflated,it can easily cause the balloon to explode at high temperatures.You can reused the foil Mylar balloons.