This small mesh ball prevents the build up of lime scale in all types of kettles, often called kettle "furring". Simply place the kettle descaler in any type of kettle after washing, and lime scale fur will collect on the fine stainless steel wire as the water boils. The kettle is then kept free of deposits, reducing boiling time and energy costs, and prolonging the life of the element.Materials: Stainless steel meshCare: Place under cold running water and squeeze out lime scale deposits