Thick, bonded coffee filter squares. Unbleached. Chemex filters cut out all the bitterness, sediment, and oils that traditional paper filters sometimes let through to your cup. The square is folded into a cone shape, which is best used along with a Chemex Coffee-Makers, but can be made to fit any dripper that uses conical filters. As the saying goes, "Perfect coffee begins with genuine Chemex coffee filters. Accept no substitutes." Comes in a box of 100.