304 stainless steel, it is labor-saving, corrosion-resistant, easy to use, and does not take up space Backwashing the coffee machine helps to remove the coffee residue that has accumulated inside the coffee machine for head The blind filter can be used in conjunction with the cleaning sheet Please make sure that your coffee machine is equipped with a suitable pressure relief for and the diameter is suitable for your coffee machine for Always follow the manufacturer ' s cleaning instructions It is installed in the group handle and replaces the standard filter