The Guilbert Express's Butane Gas Cartridge 555 is a high-performance system that delivers more high-powered levels of butane than most singular-cartridge butane apparatus. These cartridges are ideal for blowlamp (Ref. 511) operational functions, as well as oxy-torch-type oxy-gas collections (2901 as well as 2902). It possesses a weight of 340 grams.