Superior Japanese materials and workmanship. Designed for optimal flow and performance. Reduces channeling and uneven flow. Works best with #2 filters. Dishwasher safe. Our trapezoid dripper was created in partnership with Japan's inimitable Marausa Porcelain Factory, which had produced award-winning porcelain since 1916. Each dripper is fired for twelve hours at 1300 degrees, resulting in a structure that's dense and durable and will provide many years of satisfying coffee-making experiences.