This Elegant Chemex hourglass design has been around since 1941. You can process your coffee, cover and refrigerate it for later use. The non-porous Borosilicate glass will not absorb odors or chemical residue, offering you a clean, crisp, cup with no oils, sediment, or bitterness. Use a medium ground coffee for best results. 3 Cup / 15oz. Elegant one-piece hourglass design with wood collar and leather tie.