This is a Thermos mountain bottle (900ml). The color is clear stainless steel. Please refer to the 9th photo for the specifications. It has only been used for water and hot water, so there is no staining or hardening inside. There are scratches on the body and dents on the bottom from use in the mountains, but there are no problems with use. I am selling it because I have replaced it with a smaller size. ★Instant purchase is OK.