Outdoor Revolution’s Iso Butane Gas Cartridges use a superior blend of Iso Butane and Propane for a gas that works better in colder conditions, and generally burns hotter and more effectively. The gas cartridges have been developed to be the safest on the market with Triple Seaming around the rim and also features Rim Vent Release, which allows the gas to escape safely if the cartridge is over exposed to high temperatures. The gas is compatible with Outdoor Revolution’s Single Burner Gas Stove and Portable Gas Heater. Packed in environmentally recyclable cardboard packaging rather than plastic wrap