This is a good quality jumbo foil balloon 33 . There is 1 foil balloon in a pack. The balloon needs helium to be inflated. It is automatic self sealing. The size is approximately 28 inch x 33 inch (71 cm x 84 cm) . WARNING: CHOKING HAZARD - Children under 9 years old can choke or suffocate on uninflated or broken balloons. Adult supervision is required. Keep uninflated balloons from children. Discard broken balloons at once.