Chloroprene 8 ft (240 cm) Cloudbuster Balloons make Huge Impact at both outdoor and indoor events . A blend of natural and synthetic latex allows these larger-than-life balloons to withstand the elements and float for weeks when inflated with Helium. Its an all purpose whether balloon. The balloon is strong and flexible. You can close the neck of the balloon with a clip of 8 cm. To fill the balloon with Helium you need 7.7m3 Helium.