Chemex 100 Unfolded 13" Half Moon Filters Overview A pack of 100 unfolded half moon filters designed for use with Chemex coffee makers. Chemex Filters are 20-30% heavier than competitive filters and help to regulate the filtration rate to ensure proper infusion time. The filters remove sediments, fats, and undesirable oils from your coffee for a pure and flavorful cup every time. Fits the 3-cup Chemex Glass Handle Coffeemaker