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. Coffee Maker Size: 12 Cup; For Use With: BUNN® 12 Cup Commercial Brewers; Material(s): Paper; Shape: Flat Bottom.Regular Coffee Filter - 12 Cup. For Bunn, Regal, Classic Coffee Concepts and other popular drip coffeemakers as well as commercial brewers. 1,000 Filters per pack. High-quality, heavyweight paper. Taller, stronger sides to help avoid overflow of grounds. Paper stock produced using an elemental chlorine-free (ECF) bleaching method.