This MUVNA coffee whisk itself is made up of a small amount of copper and nylon material, but the majority of it is made up of sus304 stainless steel food-grade stainless steel, further ensuring that the flavor of the coffee itself is well preserved during brewing. COMPATIBLE WITH MULTIPLE FILTER SIZES - In order to meet the needs of our customers and get the best shopping experience, we offer a wide range of sizes to choose from, including 51mm, 53.3mm, and 58.35mm, to ensure compatibility with a wide range of flat-bottomed no filters. The exterior design favors metal craftsmanship, which is not only stylish, but also ergonomic and comfortable to hold, better control of pressing force, and easy to mash coffee grounds. Our new masher utilizes a cylindrical shaft as the mashing support for a smoother mashing process, enhancing the experience of making espresso. Additionally, our calibrated spring espresso masher delivers over 25-35 pounds of adjustable, constant pressure, ensuring that your ground coffee is mashed evenly for optimal extraction and a perfect cup of espresso every time. Brand Guarantee -Perfect after-sales service - We promise to provide 90-day return and replacement service if any quality problem occurs.