The Capsul'in Capsules for Nespresso brewers allows you to fill your own Nespresso capsules. Fill them with your favorite. Capsul'in is the first empty Nespresso compatible capsule that works in the full line of Nespresso machines. The Capsul'in design also features a raised ridge on the base of the capsule, making it work well with the newest and currently most popular machines that Nespresso has to offer. Questions and Answers? Q: What brewers will the Capsules work in? A: These refillable reusable espresso capsules can be used with compatible Nespresso brewers: Essenza, Citizen, Pixie, and Lattissima and other Nespresso brewers. This includes pre October 2010 Nespresso Brewers. Note: This product will not work with Dolce Gusto Brewers, Tassimo Brewers, Keurig Brewers, or any other brand. We have had some reports that it does not work the Essenza automatic model C100 brewer. Q: How do you use this product? A: Very simply: 1.) Fill the capsule with coffee or tea, 2.) apply foil lid, and 3.) brew Q: How many times can the capsule be reused? A: You can only use this product once. Q: What is the capsule made out of? A: The Capsule-in capsule is made of an FDA approved eco friendly recycled materials. Q: What about BPA? A: Our products are BPA free. All of our products use an FDA approved material. Q: What coffee grind should I use? A: Make sure you are using a good coffee, preferably something with a bold strong taste. The grind MUST be an espresso grind. If you try and use regular coffee in the capsule it will come out weak.