The My-Cap Filters are designed to be used with the Caps to Reuse Capsules. The filters help reduce the particulates in the coffee. The caps and filters together allows you to fill your own capsules. Fill them with your favorite coffee and reuse them many times before they have to be thrown out. This lowers the cost to brew each cup and also gives you better brews each time. In addition, you will be reducing your environmental impact. Each time you reuse a capsule, you reduce the cost even more on a per-cup basis. The more you use them, the cheaper they get.<br>