What makes CHEMEX Bonded™ Filters the real deal? Cone-shape ensures uniform extraction for pure coffee flavor. Will fit most other cone-shaped filter coffeemakers. Thicker (20-30% more than the competition) fiber filter design keeps bitter elements, fats and grounds in place and out of your cup. 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 the following CHEMEX® Coffeemakers, three cup Class Series (CM-1C), three cup Handblown Series (CM-1), three cup Glass Handle Series (CM-1GH), and the Funnex (CM-FNX) 100 filters per pack.