Bio-Degradable Natural Latex suitable for Air or Helium filling. Price shown is for 25 pieces. Bulk Rates show price per 25pc bag. Capacity: 0.5 cu ft per balloon when accurately sized Add to Cart and then amend your quantity as required from the Shopping Cart. The average float-time of non-treated latex balloons inflated with helium gas is approximately 12 hrs so always inflate these balloons just before they are needed. Click4 recommends treating latex balloons with Hi-Float balloon treatment which will extend the float-time when using helium from 12 hrs up to 3 days.