Yoshikawa Co., Ltd., famous for its drip pots, presents this made-in-Japan drip pot. It's made of stainless steel and can be used on gas stoves and IH heaters (photo 5). I've used it only on weekends for about six months. There are minor scratches and discoloration from heating on the outside (photo 6), but in my personal opinion, it's still in good condition (personal impression). I will clean it with alcohol before shipping. The inside (3, 4) is very clean. I only boiled water in it for coffee dripping. Also, since I only used an IH heater for heating, the bottom (photo 4) should also be clean, although there are minor scratches from placing it down. The whistle in the center of the lid handle sounds when boiling. However, there is some leakage from around the lid, so it doesn't always whistle, and the sound isn't very loud. The bottom diameter is 140mm!!