Yixing gaiwans are traditional teaware for gong fu ceremonies. One benefit of using the unglazed gaiwan is that the surface absorbs trace amounts of tea which creates a more complex flavor. This is why it is recommended to use one type of tea per vessel.
If you wish to brew different varieties of tea in your gaiwan, the glazed gaiwan is preferred.
Hand wash with water only. Do not use detergents.