What makes CHEMEX Bonded™ Filters the real deal? Prefolded for convenience. Cone-shape ensures uniform extraction for pure coffee flavor. Will fit most other cone-shaped filter coffeemakers. CHEMEX Bonded™ filters remove undesirable elements from the coffee and are compostable. Thicker (20-30% more than most of the competition). Oxygen cleansing is a bleach-free process, ensuring no chemical residue or taste is imparted to the filter. Works well with all types of roasts- even tea! The CHEMEX® coffeemaker brewing system is a preferred method of roasters and baristas worldwide. Our filter paper is manufactured in the USA from North American materials only, adhering to responsible and sustainable practices. Easy clean-up. No trays, no baskets, just simply remove the filter and discard. Fits all CHEMEX® Coffeemakers except for the Three cup Class Series (CM-1C), Three cup Handblown Series (CM-1), Three cup Glass Handle Series (CM-1GH), and the Funnex (CM-FNX).