This is a good quality foil number 5 balloon. The size approximately 23 inch x 33 inch or 58 cm x 83 cm. This is self sealing foil balloon. There is 1 balloon each package.Balloons will arrive uninflated. You need helium to inflate the balloons. Always dispose of balloons properly. Do not release balloons into air.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.