BUNN filters are specially designed to work with BUNN brewers. 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. Oxygen whitened filters are the perfect choice for clean, crisp coffee. Brown unbleached filters may leave a “cardboard” taste in your coffee, while permanent wire-mesh type filters can quickly clog with coffee oils. A clogged filter may result in your brew basket overflowing or steeping the coffee too long, potentially resulting in over-extracted bitter-tasting coffee case of 1000 filters 100% biodegradable Tested to meet all FDA requirements 2.75" x 3" (6.99 cm x 7.6 cm) Designed for BUNN brewers, fit most flat-bottom coffee funnels Works with all Residential BUNN Coffee Makers.