Ekobrew Refillable K-cup for Keurig Brewers Compatible with Keurig 2.0 K200, k300, k400, k500 series of machines and most Keurig 1.0 Single serve brewing machines. Not compatible with b/k 30, 130, 150, 145, 155, Mr coffee bvmc-kg5, Vue or Hamilton beach single serve machines Made in the USA. Because both the ekobrew and the 2.0 Compatible ink are made in the USA, there is never any reason to be concerned about potential lead based materials being used, as there is in some offshore products Can be used with Ekobrew optional paper filters(optional). Having largest brew chamber means the Ekobrew holds the most coffee, and allows the user to customize the brew strength to their own personal taste Made from 100% BPA and lead free material