The second generation Quell reusable filter has been carefully engineered for your Stagg XF pour over coffee drippers. The precision photo-etched stainless steel filter is designed to match the flow rate of paper filters while reducing water bypass. (Bypass occurs when water exits the filter above coffee grounds. Bypass results in a weak, unplesant brew) An injection-molded, food-safe silicon rim provides a cool touch area for easy disposal of coffee grounds. Quell reusable filters are built to stand up to the daily demands of the cafe and your home. You can expect a perfect fit in all Fellows Stagg X brewers. Our filters brew a smooth full-bodied cup of coffee, rich with oils and flavors that are normally trapped by paper filtration. The polished stainless steel and silicon construction doesn't impart any flavors and is designed for easy cleaning. Say goodbye to waste, unwanted paper flavor, leeched chemicals, and expensive coffee filters. Say hello to sustainable brewing, rich full bodied coffee, and essential oils and nutrients. We recommend brewing with a a medium to fine grind for best results. Better for your daily brew, the environment and your wallet.