Cone-shape ensures uniform extraction for pure coffee flavor. Thicker (20-30% more than the competition) specialty fiber filter design keep bitter elements, oils, and grounds in their place (and out of your cup). Pre Folded for convenience. Will fit most other cone-shaped filter coffeemakers. Removes impurities, acidity, unhealthy and bitter elements from the coffee. In your brewed cup you will find only the caffeine and desirable aromatic oils of the coffee beans. Fits all CHEMEX® Coffeemakers except CM-1, CM-1C, CM-1GH, CM-FNX.