More convenient and economic! Perma-Brew 3 Year Re-useable Coffee Filters offer solutions to the world's most common coffee-related problems. Always ready to use: No more running out of filters! Ecologically sound: No more daily filter disposal! Easy to fill: No more trying to separate a single filter from a stack of paper filters! The filters' rigid shape makes them easier to fill with coffee and easier to insert in the coffeemaker than paper filters. Fits coffeemakers using 3 ½” disk filters or wraparound filters including 7 to 14 cup electric percolators and stovetop percolators, and 8, 10 and 12 cup Norelco original Dial-A-Brew models. They feature micro-fine filter openings which retain coffee sediment while flavor and aromatic components pass through for optimum extraction and "fresh brewed" taste. Dishwasher safe and will fit most coffeemakers that use disk or wrap-around percolator filters, including electric and stovetop percolators. Good for the environment and good for your wallet!