Made of premium stainless steel. This water heater is rust proof corrosion resistant of high safety and long service time. spiral immersive design provides a uniform heat and fast thermal conductivity. High power ensures a quick heating speed so it is very convenient to use. It is light weight & compact size, easy to carry and store. It can be used in water, specially fit for heating water in large size container like bucket, basined etc. refresh and reenergise yourself with a hot water bath anytime using this water heating rod.