Rosendahl Grand Cru Filter Brewer fits all size 1 x 4 coffee filters. It fits the tall Grand Cru Thermos Jug – it can be screwed into the top for reliable, stable brewing of coffee. The coffee filter makes brewing coffee simpler yet more luxurious. The Filter Brewer is for people who want a more hands-on approach to brewing coffee, with a focus on simplicity and authenticity. It suits coffee enthusiasts and those adventurous enough to want to explore a traditional way of brewing coffee; it’s great, too, for an active life on the go, for example if you enjoy camping or other outdoor activities but you still appreciate a decent coffee.