Thank you for viewing. This is a Snow Peak titanium mug, 450ml. It's a single-wall (single-layer) mug, making it lightweight and suitable for direct fire. It has discolored due to direct fire use with a gas stove. Please refer to the photos. This is a used item, so please refrain from purchasing if you are looking for the pristine condition of a new item or if you are overly concerned about minor imperfections.