The disc screen is made of stainless steel, ensuring quality and durability, providing you with a high-quality coffee experience for a long time. The 0.8mm thick puck screen doesn't require you to consciously cut back on coffee. It allows you to easily maintain the perfect amount of coffee. [Keep it Clean]The 51mm disc screen effectively separates coffee grounds from the brewing head and prevents coffee grounds from accumulating. This means you can enjoy your coffee without spending a lot of time and effort maintaining and cleaning the group head. [Double-layer Structure]The espresso ice ball is equipped with a double-layer structure. One layer has smaller pore sizes, while the other layer has larger pore sizes. When inserting the disc into the handle, make sure the large hole is facing upwards for faster distribution of hot water into the coffee and improved extraction efficiency. [Stable Extraction]The pores of the espresso filter are evenly distributed, which can effectively reduce channeling. This improves the overall uniformity of extraction. You can expect a consistent and delicious cup of coffee.