Refillable coffee filters for Keurig models: B10,B30,B31,B40, B44, B50, K55, B60, B66, B70, B77,B77,B79,B100,B130,B135,B140,B145,B150,B200,B1250,B1255,K10, K45, K65,K75, K145, K200,K300,K350,K360,K450,K460,K500,K550,K560,K575. DOES NOT WORK for Keurig Cuisinart version and K155, K250(After 2016)..Reusable k cup replaces Keurig K Cups and all other reusable coffee filters for Keurig Home Single Cup Brewing Systems.Compatible with Keurig 1.0 & 2.0, K200(Before2016) K300, K350, K400, K450, K460, K500, K550, K560.Use your own gourmet ground coffee in a Keurig brewer--Just fill the Reusable filter with your favorite coffee and pop it into your brewer.....Just like regular k cups.Simply fill with your favorite coffee or tea and brew. Rinse with water when finished.