<b>COMPATIBILITY: </b></br> These Keurig compatible reusable Cups will fit most Keurig coffee makers, including Keurig 1.0 and 2.0 models: K31, K40, K44, K45, K50, K60, K66, K70, K77, K100, K135, K140, K300, K350, K400, K450, B31, B40, B44, B50, B60, B66, B70, B77, B100, B140, B200, and any of the following machines: Elite,Classic, Ultra, Special Edition, Ultimate, and Platinum.</br></br> <b>Important：</br> Do not fill above the stainless steel mesh. Do not use fine ground coffee.</b></br>