1. [Only Compatible with Listed Machines] This 54mm three-ear bottomless portafilter is only compatible with Barista Pro (BES878), Barista Express Impress (BES876), Bambino Plus (BES500), Infuser (BES840), Barista Touch (BES880), Barista Express (BES870), Duo-Temp Pro (BES810), and Bambino (BES450). Not compatible with other coffee machine models. Please confirm your machine model before placing an order to avoid compatibility issues.<br>2. [The Advantages of a Bottomless Portafilter] The bottomless design allows you to clearly observe the entire extraction process, helping to spot and correct issues with grind, distribution, or tamping. It's a must-have for those looking to improve their espresso quality.<br>3. [Included Puck Screen for Even Extraction] The Puck Screen promotes even water distribution across the coffee grounds, reducing channeling and ensuring consistent extraction. It also helps maintain the cleanliness of your machine's brewing head. from Food-Grade Stainless Steel: Constructed with high-quality food-grade stainless steel, this portafilter guarantees and durability, ensuring that your espresso remains pure and taste-free from contaminants.<br>4. [304 Stainless Steel Double-Shot Filter Basket] Made from durable 304 food-grade stainless steel, the included double-shot filter basket ensures a pure, untainted espresso extraction while preserving the rich flavor of your coffee.ess Design for Improved Extraction Quality: The bottomless design of this portafilter allows for better observation of the coffee extraction process, enhancing the quality and consistency of your espresso.<br>