Set Of 6 Butane / Propane Mix Gas Canisters, Cartridge Fitted With Standard Type En 417 Threaded Self-sealing Safety Valve.please Note: Gas Canisters Can Only Be Shipped To Uk Mainlandbutane / Propane Mix Gas 350gsupplied In A Set Of Sixhigher Propane Content For Even More Heat And Powersuitable For Use At Lower Temperatures; Effective To -20cdouble Skin Safety Valvenon-refillablefilled To The European Standard En417can Be Used For Blow Torches, Chef Torches, Weed Burners, Lanterns