Perma-Brew 3 Year Re-usable Coffee Filters are more convenient, and economical than paper filters. Always ready to use-no more running out of filters. Ecologically sound-no daily filter disposal. No more trying to separate a single filter from a stack of paper filters. Rigid shape makes them easier to fill with coffee and to insert in the coffeemaker than paper filters. Micro-fine filter openings retain coffee sediment while flavor and aromatic components pass through for optimum extraction and inchfresh brewed inch taste. Made of laboratory-grade materials. Dishwasher safe. Three year warranty. Fits most coffeemakers using disk or wrap around filters including percolators and other coffee pots with central stem in basket.