Race Car Birthday Foil Balloon 43 . There is 1 foil balloon in a pack. The balloon needs helium to be inflated. It is automatic self sealing. The size is approximately 43 inch or 109 cm . WARNING: CHOKING HAZARD - Children under 9 years old can choke or suffocate on un inflated or broken balloons. Adult supervision is required. Keep un inflated balloons from children. Discard broken balloons at once.