18 inch Congratulations You Have Passed Foil balloon inflated with helium. Supplied with a coloured ribbon of your choice, a balloon daisy and a standard weight. In cold air the helium balloon will deflate slightly although exposure to warm air will revive it. Excessive heat may cause the balloon to burst. Manufactured in the UK. Caution: Do not release helium-filled balloons outdoors or near power lines. This balloon may conduct electricity. Misuse can cause injury. Dispose of properly. Helium gas should never be inhaled. Inks used on this balloon conform to government standards that relate to children’s toys.