These impulse sealers made by AIE are manufactured under the strictest quality controls. Every unit is pre-tested and warranted in the United States guaranteeing efficiency dependability and longevity. Ideal for a multitude of applications. Makes excellent air and water tight seals on materials like:Polyethylene Pliofilm P.V.A.Polyurethane Kel-F TivacPolyvinylchloride Polyflex SaranPolypropylene Mylar NylonThese sealers do come with extra elements. You don`t have to buy the following kits with your sealer. These are for future use or if you anticipate heavy production. 5 Piece Kit (2 Heating Elements, 2 Upper Teflon & 1 Lower Teflon) for All Type Hand Sealers.All Sealer are 110 Volts ( 220 Volts Units Available for an additional charge Upon Request ) Round Element Wire Available For Cut & Seal.