CHEMEX - simple, easy to use with timeless, elegant design All CHEMEX Coffeemakers are made of the highest quality, non-porous Borosilicate glass which will not absorb odors or chemical residues The patented CHEMEX pour-over design allows coffee to be covered and refrigerated for reheating without losing flavor All CHEMEX Coffeemakers are measured using 5 oz. as 1 cup Use CHEMEX Half Circle Filters FP-2, Filters not included.