BUNN Commercial Coffee Filters, 6 gal Urn Style, Flat Bottom, 25/Cluster, 10 Clusters/Pack - Manufactured from high quality, heavy weight paper, so the water flows properly through coffee/tea. Uniquely designed for strength so the sides are taller and you don't end up with overflow and grounds in your coffee. Produced using an elemental chlorine-free (ECF) bleaching method.