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). Prefolded for convenience. Will fit most other cone-shaped filter coffeemakers. Fits all CHEMEX® Coffeemakers except CM-1, CM-1C, CM-1GH. Box of 100 filters.