COMPLETE BREW CONTROL - Attach the AeroPress Flow Control Filter Cap to any AeroPress coffee maker to stop drip through which allows you to extend brew time and use coarser-ground coffee like pre-ground medium. ESPRESSO-STYLE CREMA - When used with a paper filter and dark roast coffee, the AeroPress Flow Control Filter Cap uses a build up of pressure to create an espresso like crema. FILTER FLEXIBILITY - The flexible AeroPress Flow Control Filter Cap can be used with the AeroPress Stainless Steel Reusable Filter or AeroPress Paper Micro-Filters (or even both at once) to create a variety of delicious flavor profiles. (Filters sold separately) FITS ALL AEROPRESS COFFEE MAKERS - Compatible with AeroPress Go and AeroPress Original. Designed in Silicon Valley, Made in USA