Bunn developed the first commercial paper coffee filter, so we know consistent paper porosity and filter structure is critical to delivering that same great tasting cup of coffee to you, every time. 100% Biodegradable. Tested to meet all FDA requirements. 2.75'' x 3'' home brewer filters. For 8 and 10 cup Bunn coffeemakers. Fits most other automatic drip coffee brewers for the home. 100 filters per box.