Ultra-thin 150-micron screen for even water distribution and extraction: This 150-micron (0.15 mm) puck screen is placed on top of the tamped ground coffee (the "puck") in the portafilter before extraction. It acts as a dispersing sieve, transforming the machine's concentrated water jet into a fine, even "rain" that saturates the entire grind homogeneously. This eliminates preferential channeling and optimizes flavor extraction. Food-grade 304 stainless steel for durability and flavor neutrality: Made of high-quality 304 stainless steel, this screen is resistant to corrosion, coffee acids, and high temperatures. It doesn't impart any metallic or unwanted taste to your espresso and guarantees exceptional durability, even with intensive daily use and cleaning. Compatible with most standard 58mm portafilters: With a diameter of 58.5mm, this screen is designed to fit perfectly inside the majority of 58mm portafilters (filters), the industry standard. It simply sits on top of the tamped coffee. Check your filter's diameter to confirm compatibility. Its 1.0mm thickness is minimal so as not to affect the available space in the portafilter. Easy to clean: Unlike disposable paper filters, this steel screen is a permanent accessory. After each extraction, simply eject it with the used coffee puck, rinse it with water, or clean it with your usual routine (coffee descaler). This reduces waste and long-term costs. It improves espresso quality and protects the machine: By ensuring even water distribution, the screen allows for a more complete and balanced extraction, enhancing the crema, body, and clarity of flavor in your espresso. Furthermore, it prevents fine coffee particles from rising and clogging the holes in your machine's shower screen, making maintenance easier and extending its lifespan.