This set of 500 12-cup Bunn 9 3/4" x 4 1/4" coffee filter is perfect for cafes and diners that are consistently brewing coffee for their patrons. Using the results of years of research, the genuine filters made using an environmentally-friendly elemental chlorine-free (ECF) bleaching method, the durable, heavyweight paper construction allows proper water flow for better tasting coffee. They do be a good helper for coffee lovers and will deserve your favor. This coffee filter features a semi-permeable surface in which it is permeable by liquids, but not solids. It will increase the purity of coffee when you make the coffee. Also, filter will not disintegrate when wet, ensuring that the grounds stay out of your coffee and in the filter where they belong. Filter sheet easily stacks and separates from other filters to ease the coffee brewing process.