CHEMEX® Bonded Filters 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 What makes CHEMEX® Bonded Filters the real deal? Square Cone-shape ensures uniform extraction for pure coffee flavor Thicker (20-30% more than the competition) specialty fiber filter design keeps 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 Fits CHEMEX® Three cup Class Series Box of 100 For 1-3 cups Filter FP-2N