The Water heater elements are made of durable copper material with Chrome coating. it's high temperature resistance, corrosion resistance, good thermal conductivity and anti-mineral accumulation. All of them were strictly tested per our pre-shipment quality control process to ensure stable performance and longer service life. CONTENTHWD UNIVERSAL SCREWIN WATER HEATER ELEMENT 2pc Pack includes Heater Element Wrench and Quick Change Tool Water Guide Board. This screwin, hign watt densitystyle heating element can be used in most replacement situations of the same wattage and voltage. It reduces lime deposit buildup when used in areas with hard water POWER 4500W 240V, Watt Density at 240V Wsq. in. 208, Cold Resistance ohms 12.80, Outer Sheath Material Copper DIMENSIONElement Diameter 1, Element Length Flange to Tip in. 13916, Mounting Type Threaded, Socket Size 112 COMPATIBILITYElement fits most models of American, AO Smith, Bradford White, Craftmaster prior to 1991, GE, GS Wood certain models, Kenmore, Lochinvar, Maytag, MorFlo, Reliance, Rheem, Richmond, Rudd, Sears, State, Whirlpool, and hot water heaters manufactured after 1994. ONE YEAR WARRANTYUL CERTIFIED WATER HEATER REPLACEMENT PART WITH ONE YEAR WARRANTY Hot water heater element is UL listed for US and Canada.