1.[Vast Compatibility for Keurig 2.0 and 1.0]: K200, K250, K300, K350, K360, K400, K450, K460, K500, K550, K560, K15, K31, K40, K44, K45, K50, K60, K66, K70, K77, K80, K100, B31, B40, B44, B50, B60, B66, B70, ,B77,,B100, B140, B200 As Well As The Following Brewers: Keurig Elite, Keurig Select, Keurig Classic, Keurig Ultra, Keurig Special Edition, Keurig Ultimate, and The Keurig Platinum. Breville K CUP, Mr. Coffee K CUP. 2.[More Sturdy and Tight] :Reusable K CUP are made with High Quality 304 meatal mesh. This reusable K CUP have a sturdy construction and tight lid, you will taste the great coffee you never have! 3.[ Environment and Economical ] : We can save up to 80% money 1.K CUP no leak and keep your home clean. 4.[Easy to Use and Clean] : Reusable K CUP are very easy to use, just fill the coffee grounds you need into the reusable K CUP, after using, just dump the grounds into the trash and wash the reusable K CUP filter by water. Also these refillable single K CUP are safe for dishwasher