CHEMEX coffee maker 3 cup Known as a pristine coffeemaker, Chemex employs all of the chemically correct methods for brewing. Its hourglass shaped flask is made entirely of glass, a chemically inert material that does not absorb odors or chemical residues. The Chemex Glass Coffee Maker has no moving parts and will work forever, unless it is dropped or in some other way demolished. Chemex filters are made of the highest quality filter paper. Please note: All of the coffeemakers are measured using 5 oz. as 1 cup. Includes a polished wood collar with leather tie.