[304 Food Grade stainless steel]The Bottomless Portafilter is made of food-grade Stainless Steel, eco-friendly and non-, more sanitary and , has the characteristics of oxidation resistance, resistance, rust resistance and durability [Compatibility] This two ears portafilter 51mm fits for ECP3420/EC155/BCO430/EC260 etc 2 ears coffee machine. [Filter Basket Included]Stainless steel 51mm filter basket included and compatible with 's stock 51mm filter basket [Extraction Improvement]the bottomless design can help observed the column, rate, color, column , etc., find the defects and errors before extraction, and better judge the uniformity of extraction, thereby making it more delicious and more consistent Espresso [Removable & Easy to Clean]- The detachable design is convenient and quick to disassemble, easy to use, and easy to clean without dead corners.