... 4. Size: 9", 12". balloonI.balloon,latex balloon,advertising balloon,birthday balloon,party balloon.II.we have different weight balloon:1.5g,1.7g,1.9g ... makes the volume adjustable.Filling the balloon with air can be done with the mouth, a manual or electric inflator (such as ... ability to keep the helium gas from escaping for several weeks.water balloons are thin, small rubber balloons, filled with ...