Small Suribachi Mortar, Size 5 Diameter: 15.5 cm Height: 6.5 cm This size is highly recommended and very easy to use. For dishes like sesame seed and walnut dressing, or sansho (Japanese pepper) dressing, you can grind ingredients in the suribachi and then mix them directly with vegetables, serving them in the same bowl. Many people also use it for making baby food. I am listing this item because I have various sizes. I ground golden sesame seeds in it twice. The discoloration on the inside is likely from the pigment. Overall, it doesn't show much use, but there is some color transfer, so I have lowered the price.