Latex Clear Balloon 30cm - 50th Birthday Medium printed clear latex balloon. Size: 30cm or 12 inches Quantity: 1 Suitable For Air or Helium Inflation. All balloons delivered uninflated. Helium inflation booked in store only. Nifty and Fifty, celebrate your 50th Birthday with our clear printed latex balloons. Use alone to create an original centerpiece or mix and match with different balloon sizes for a custom balloon arrangement!