Made small for ease of use. Comes in a value pack of 4. ■ Small Inkstone Mud Abrasive Stone (Doro-toishi) - 4 stones per bag - For cleaning Suiko, Endai, Amatake, and Ogatsu inkstones. Photos are used for multiple listings, so they may vary. Approximately 2cm x 4.5cm, 4 stones per bag. A size that is easy to use even for small inkstones. As these are natural abrasive stones, cracks and chips may be present. Please understand. The feel of using it is that it is fine-grained yet firm, and it dissolves moderately to become mud. Additional bags are available for 1180 yen each. Please inquire. This product is made by cutting the part of a large stone layer that is suitable for inkstone abrasive stones. It has a fine grain and does not contain many hard foreign objects. I use it to create light ink, so I use it every time like cleaning the inkstone. Just fill the inkstone with water and grind it with the mud abrasive stone. It's the same way you grind ink. For detailed instructions, search for "Inkstone Mud Abrasive Stone" (硯 泥砥石) and you'll find various resources. This is a calligraphy supply for old ink. Brushes, calligraphy brushes, Kumano brushes, Ikkyu-en, Kubota-go, Kodo, Shuhitsu-do, Bumeido, Suishoen, Kana brushes, Kanji brushes, performance brushes, large character brushes, thick brushes, fine brushes, small brushes, color brushes, flat brushes, Choryu Inkstones, Japanese inkstones, Amatake inkstones, Ogatsu inkstones, Endai inkstones, Rokou, paper, hanshi, han-setsu, gasen-shi, tenkoku, inzai Calligraphy, calligraphy set, calligraphy bag, calligraphy model, underlay, calligrapher, calligraphy tools, calligraphy supplies, calligraphy works, calligraphy, writing, calligrapher, art, sutra copying, sutra copying paper Japanese painting, design drawing, watercolor painting, sumi-e, ink painting, art supplies, blue ink, rapeseed oil smoke ink, sesame oil smoke ink, pine smoke ink, Genrin-do, Bokundo, Kobaien, Kuretake, Kaimei, Suzuka ink, bulk sale, wholesale Ink, old ink, Japanese ink, solid ink, calligraphy ink, ink liquid, ink, ink pond Calligraphy/Shuji supplies... Inkstones, ink, hanshi, brushes, paperweights, calligraphy sets, others