Prefolded for convenience. Will fit most other cone-shaped filter coffeemakers. Works well with all types of roasts - even tea! Allows you to make the perfect and most pure cup. Our filter paper is manufactured in the USA and uses only USA materials. Responsibly harvested and conforming to SFI, FSC, and PEFC sustainable programs Compostable and biodegradable. Easy clean-up. Fits all CHEMEX® Coffeemakers except CM-1, CM-1C, CM-1GH, and CM-FNX