Magnesium Foil is very hard to obtain and is usually very expensive. This material is very useful when experimentation calls for a large surface area of pure magnesium metal. The foil piece measures about 0.05mm (thick) x 120mm (long) x 80mm (wide) (.002" x 4.72" x 3.14") Welcome to visit our official website : http://www.cathodicprotection-anodes.com