Features: * brand new and high quality * This blind filter is used for back flushing on semi-automatic espresso machines that have a pressure release mechanism. It fits into the group handle in place of the standard filter. Back flushing your coffee machine helps to remove coffee residue which builds up inside of the group head. The blind filter can be used in conjunction with cleaning tablets. *Please ensure that your coffee machine features an appropriate pressure release valve and that the diameter is correct for your coffee machine. *When performing back flush cleaning, remove the regular (single or double) filter out of your portafilter handle and insert the blind filter instead. *Always follow the manufactures cleaning instructions. Specifications: *Material:stainless steel *Color:Sliver *Size: (Approx)：as shown Package Contents: 2x Coffee machine filter Note: 1. The real color of the item may be slightly different from the pictures shown on website caused by many factors such as brightness of your monitor and light brightness. 2. Please allow slight manual measurement deviation for the data.