This bulk package contains 12 individual DCC-RWF charcoal filters. These filters are specifically designed for Cuisinart Coffeemakers, and meet or exceed factory specifications. Filters meet FDA requirements.
You don't have to worry about your carbon filter expiring. As in most cases, cooler temperatures will slow it's aging, but you can stock up on filters for a few years if you want. The main thing to remember is that once it becomes wet it should be changed according to the manufacturer's guidelines.