These Chemex coffee filters are made of 100% organic cotton. Unlike paper filters, cotton leaves no flavor behind on the coffee. The cotton absorbs some of the oils from the coffee but will let the acid come through for a crisp and robust flavor. Filters should be replaced about once a year if used every day, includes 2 filters.
Works well with the design of the chemex, stays in place, and is easy to rinse out. Produces good tasting coffee.
Happy with the purchase!