Many believe that what makes Chemex coffee so delicious is their proprietary bonded filters. They are specially engineered to be thicker and heavier than normal paper filters which means that they remove a higher proportion of those unwanted components within the coffee. As such, you'll find less bitterness and less sediment in a cup of coffee made with them, no matter how strong you brew. Each box includes 100 paper filters made by the Chemex Corporation for use with the Chemex Coffee Maker Please note that the folder paper filters will fit a 6 Cup, 8 Cup or 10 Cup Chemex but not a 3 Cup. The 3 Cup filters will only fit a 3 Cup Chemex. Please be sure to choose the right size!