<p><b>Fits for most Keurig Brewer models (K-Classic,K-Elite,K-Select). </b><br><br> <b>Compatible with Keurig 1.0 Brewers:</b><br><br>K10, K15, K40, K45, K50, K55, K60, K65, K75, K79, B31, B40, B44, B50, B60, B66, B76, B79, B130. <br><br> <b>Compatible with Keurig 2.0 Brewers: </b><br><br> K200, K250, K300, K350, K400, K425, K450, K475, K500, K525C, K545, K550, K575. <br><br> <b>Important Note: Does Not work for Keurig Mini and Cuisinart version</b><br><br><b>FAQ</b><br><br> The YEOSEN K Cups are specially designed to brew coffee slowly, average brew time is about 1 minute. We recommend filling approximately 75-85%<br><br> <b>What type of coffee Grind is best ?</b><br><br> We recommend Medium Grind Coffee , Fine ground coffee ( Like espresso for example) tends to retain a lot of water and you will not get a full cup of coffee Too Coarse ground coffee (that is to say not ground enough and have bigger chunks) the water will pass right through and not fully absorb the the coffee resulting in a weak water down coffee.<br><br> <b>Sometimes I get less Coffee in my cup then what it says on the machine</b><br><br> Coffee retains water. If sometimes you are attempting to brew an 8oz cup of coffee but you only get 6oz it’s because the grind of coffee you are using retains more water. Simply run it a second time (no need to change coffee as flavor would not have been fully drained). <br><br> <b>Why choose YEOSEN products? </b><br><br> * Alomst suitable for most Keurig 2.0 & 1.0 Brewers and more. <br> * Can be reused many times,easy to clean and saving your money. <br> * safety material and eco-friendly. <br><br> <b>100% Satisfaction Guaranteed: </b><br><br> If you are not satisfied with the Reusable K Cups, please contact our customer care team, and let us make it right. We guarantee Free Replacement or a Full Refund promptly!</p>