Use your own gourmet ground coffee in a Keurig brewer;100% BPA Free, Works With, K31, K40, K44, K45, K50, K60, K66, K70, K77, K100, K135, K140,;Works with Keurig B31, B40, B44, B60, B50, B66, B70, B77, B200, B140, Breville Kcup, Mr. Coffee Kcup , Cuisinart Kcup;No need to remove or swap out the filter holder; Built-in permanent stainless steel micro mesh filter;Not Compatible with Keurig 2.0, Vue, B30, B130, B145, B150, B155, K30, K130, K145, K155, K150 And Commercial Models