The integrated 200 Micron laser etched membrane creates the best dispersion pattern over your coffee while reducing the build up of coffee on the back of the screen. This one piece design provides solid performance.
The 8.5mm Yellow silicone group gaskets (seals) fit most E61 brew group espresso machines.
They hold up very well in brew groups and remain soft and leak free longer than rubber. The softer silicone makes engaging the portafilter easier thus less effort and strain on your wrists.