Melitta Original coffee filters are perforated with small, tiny holes (aroma holes) that allow for optimal brewing speed of the coffee. All the aroma goes into the cup while the bitter substances remain in the collection container. Melitta Original coffee filters are made from Nordic paper pulp. The filters contain no recycled fibers. The punched edges are machine-pressed, meaning no glue or other binding agents are used. For the benefit of the environment, they are both Swan and FSC certified (Forest Stewardship Council). Contains 40 filters.