Glazed porcelain pleated into 20 sharp ridges, like a paper cup folded by hand. The ridges do the work. They hold the filter off the walls so air escapes and the water drains at a steady pace. It is Mino ware, made in Gifu, Japan, and comes in a dozen colors. Brews one or two cups, and it needs a holder to sit on a mug.

Material
Porcelain (Mino ware)
Made in
Japan
Dimensions
Ø 11.5 × 7 cm