Hello coffee geek! Filters to use with your Chemex Coffee Maker These pre-folded filters are 20–30% heavier than most to remove even the finest sediment particles as well as the undesirable oils and fats. The formulation of the filter permits the proper infusion time by regulating the filtration rate so it’s not too slow, not too fast. Good infusion of the coffee grounds gives your coffee a richer flavor and makes possible precise extraction. Perfect infusion filters out the undesirable components that make coffee bitter and allow only the desirable flavor elements of the coffee bean to pass through. The Chemex filter is folded into a cone shape, exactly as in laboratory techniques. This assures uniform extraction, as the water filters through all the grounds on its way through the cone. These filters are guaranteed not to burst under the weight of the liquid during filtration and not to break when lifting out the grounds. Filters fit the Chemex Classic Series Drip Coffee Eight-Cup Glass Coffeemaker #977462. Made in the USA.