Fabricated from "tough as nails" high quality porcelain, this set can take quite a bit of abuse. Choose from 60mm (2.3"), 100mm (4"), or 125mm (4.9"). Glazed outside and rough inside for efficient grinding and features a footed bottom for stability and pouring lip. The pestle is oversized for hand comfort and is unglazed on the bottom. Rims and outside of mortars are glazed with non-lead based glaze. Aside from general laboratory purposes, this is great for grinding powders, herbs or medicines.