Save money - our cafes save on reusable k cup coffee filters, which is worth it! These reusable coffee machine capsules (reusable k-cup filters) are designed for budget conscious coffee drinkers and can save up to 80% of the cost compared to pre filled and pre fabricated coffee boxes. When you can buy a bag of coffee or a container of coffee grounds to fill, why pay more at retail price? Make a cup of fresh coffee - you can grind your own fresh coffee grounds and use them with Keurig coffee machines or other compatible single cup coffee machines. Fully tested for compatibility - Reusable coffee filters (coffee boxes) can be used with Keurig k-Mini, k-Mini Plus, k-Duo Essentials, k-Duo Plus, k-Slim (single stream brew machine), k-Classic, k-Elite, k-Latte, k-Caf , k-Select, k-Compact and Keurig 1.0 and 2.0 coffee machines.