Serious coffee aficionados understand the need for a serious, permanent filter system. The true magic is the 24 Karat gold-plated, scientifically engineered foil filter. The precisely designed openings of the SwissGold® permanent filter hold back only the unwanted solids, while allowing the desirable flavor carriers to pass through for a perfect cup every time. The KF 4 swissgold® 24 Karat gold-plated permanent cone filter fits all coffee makers that take a #4 paper filter. Mostly used in drip coffee maker with a 6 - 12 cups capacity, but also works well with machines with larger funnel volumes thanks to its detachable collar, included.