This is a gas cartridge from Optimus.
The canister weighs 621g and contains a 450g blend of butane (50%), isobutane (25%) and propane (25%). The latter ensures that the stove functions properly, even in difficult conditions (below zero temperatures, high altitude and wind). The cartridge is equipped with a threaded valve, which is compatible with camping and mountain stoves and meets the EN417 standard. After use, the cartridge can be safely unscrewed thanks to its automatic closure. The bottle features a smart seal, through which the user knows right from the beginning whether the bottle is new or not.