Japanese Kyusu Teapot Tokoname Potter Gyokuryu Hand-crafted Tokoname Kyusu by a potter named Gyokuryu. This wide-mouthed kyusu, by Gyokuryu(), with a tou-ami filter, makes a lovely and quick-pouring green tea. Due to its wide mouth, this Kyusu is really easy to clean, thus making it a style that is widely loved by Japanese kyusu users. Capacity: 250ml(8.5 fl oz)