The Coleman C300 Gas Cartridge is a threaded self-sealing gas cartridge, ideal for use with camping stoves. The gas cartridge uses a (70/30) butane/propane blend which creates a consistent and steady burn across a range of temperatures. Connecting and disconnecting the gas canister from a stove is safe and easy thanks to the safety valve seal.Threaded, self-sealing gas cartridge from ColemanButane/Propane blend: 70/30%Safety valve seal - connect/disconnect with ease and no leaksGas weight: 240gRecommended activity - camp cooking