Yokkaichi Banko ware purple clay teapot, unused. RF (reduction) firing for delicious tea. Traditional craft product. ＜Instructions for Use＞ ○ Do not put directly on a fire or use in a microwave. ○ Do not remove the stainless steel tea strainer. 〇 The stainless steel tea strainer of this teapot (made in Japan) uses 18-8 stainless steel (SUS, etc.). Please use with confidence. Q. Why is tea brewed in an RF-fired teapot delicious? A. The clay of the Banko ware purple clay teapot contains a lot of iron. A. The iron (black color) that has changed due to the long RF firing reacts chemically with the bitterness (tannic acid) and astringency of the tea, resulting in a delicious and mellow flavor.