This Campingaz 3500 Gas Cartridge contains a mixutre of Butane/Propane gas and is suitable for use with Campingaz blowlamps and blowtorches. It has a high security self-sealing valve, meaning it can be easily and safely disconnected and reconnected even when not empty. Cartridge complies with EN417. Caution: This Product is Highly Flammable. 30/70% Propane/Butane Mix 1750°C. Gas Weight: 350g.