The Grand Cru coffee filter Ø 13.5 cm from Rosendahl is designed to fit the thermos of the same Grand Cru series and works with all 1x4 size coffee filters. Simply screw the filter into the opening on the thermos and you'll be able to brew coffee at your convenience with simplicity and ease. The perfect gift for a coffee lover who enjoys authentic and traditional coffee but still wants to indulge in a good cup while out and about or even on a camping trip.