EZ-Cup 2.0 by Perfect Pod for Keurig 2.0 & 1.0- K200, K300, K400, K500 Series Compatible with Keurig 2.0 & 1.0 Brewers! Use any coffee in your Keurig Coffee Machines For use with EZ-Cup throw away filters Works with Keurig K250, K350, K450, K550 and older models of Keurig Machines For Single Cup use only