The BUNN Coffee and tea filters are specially designed to work with BUNN brewers. The selection of Coffee filters is a vital step in brewing perfect Coffee. BUNN manufactures the best filters from high quality, heavy weight paper and are uniquely designed for strength. Preventing overflow and grounds in your Coffee, they are 1/4-inch taller than other filters to allow for the quick flow of water into the brew funnel and the needed mixing action for complete, even extraction.