FINE CHARCOAL-The best coffee filters are made of charcoal, which can remove impurities, calcium, chlorine, and odors that can be dangerous to health, reduce limescale, and increase the lifespan of your coffee maker. What’s more, it can improve the taste of your coffee. | Try these high-quality pack of 12 water filter replacements to keep your coffee tasting its best. | UNIVERSAL FIT- The Replacement Charcoal Water Filters work for Keurig 2. 0 brewer, Elite B40, Classic B44, Ultra B50, Special Edition B60, Ultimate B66, Plantinum B70, Plantinum K79 Plus, Officepro B145, B140, B145, B40, B45 Elite, B60, B68, B70, B75, B79, B80, K145, K155, K200, K350, K40, K45 Elite, K500, K60, K65, K66, K75. | Systems purchased after August 2007: Elite, Classic, Ultra, Special Edition, Ultimate and Platinum. | The filter fit Keurig 2. 0 machines as well as Keurig Single Cup Reservoir Brewer.