PERFECT SUITABLE FOR:Gold 40 number foil Mylar balloons are the best choice for:40th birthday party,wedding,graduation anniversary,holiday celebration,business,big events,school class party,Halloween,Christmas and New Year party decoration.You can stick the gold 40 number balloons on the wall,window or door,you can inflate with both helium or air,you can even place them on the bed, floor or table,provide your party or home a good display. PACKAGE CONTENTS: 2 Pieces 40 Inch gold number Balloons:No.4 gold number Balloon + No.0 gold number Balloon. CHOOSE THEM: The silver number balloons are made of aluminum foil, and the size of the balloons is 42 inches, which is 40 inches when filled with helium or air. Please use the straw in the balloon set to inflate it slowly. TIPS FOR NUMBER BALLOONS: Due to the thermal expansion and contraction characteristics of aluminum foil,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.Please avoid leaving the balloons in an outdoor high temperature environment for a long time.If the ambient temperature is too low,it will also cause the balloon to deflate.At this point,you can use the straw to inflate again. SERVICE: We are committed to providing customers with better products. If you have any questions, please contact us in time, we will do our best to solve the problem for you. PERFECT SUITABLE FOR:Gold 40 number foil Mylar balloons are the best choice for:40th birthday party,wedding,graduation anniversary,holiday celebration,business,big events,school class party,Halloween,Christmas and New Year party decoration.You can stick the gold 40 number balloons on the wall,window or door,you can inflate with both helium or air,you can even place them on the bed, floor or table,provide your party or home a good display.PACKAGE CONTENTS: 2 Pieces 40 Inch gold number Balloons:No.4 gold number Balloon + No.0 gold number Balloon. CHOOSE THEM:The gold number balloon is made of high-quality aluminum film that empty balloon is 42 inch,after filled with helium or air,it's 40 inch.Please use the straw in the balloon set to inflate it slowly. TIPS FOR NUMBER BALLOONS: Due to the thermal expansion and contraction characteristics of aluminum foil,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.Please avoid leaving the balloons in an outdoor high temperature environment for a long time.If the ambient temperature is too low,it will also cause the balloon to deflate.At this point,you can use the straw in the suit to inflate again,and the balloon will be in perfect condition again. SERVICE:We do our best to provide customers with better products. If you have any questions, we promise to give you a satisfactory answer without any delay.