The Coleman C300 Performance Gas offers a (70/30) Butane/Propane gas mixture, providing a steady and consistent burn across a wide range of temperatures at lower altitudes, making it ideal for general use. The threaded cartridge features Coleman’s double safety resealable valve, this means that the cartridge can be disconnected and reconnected to your device, without leakage. Caution: This Product is Highly Flammable.