Flexibility is the key word to describe the Sievert hand held torch system. These blowtorches provide everything the craftsman or discerning home handyman requires. With many unique features, these are the most advanced blowtorches for brazing or soft soldering, heat-shrinking, heating and dismantling work. This Sievert Torch System operates on a number of fuels from propane, butane, Propane/Butane mix, Sievert Ultragas (a highly efficient anti-flare mixture) and our MAPP and Ultramapp for extreme high heat levels.