Approximately 29 centimeters. This item was likely purchased by my mother, who frequently traveled to China 40 to 50 years ago. It is unused. I haven't found any stains, but as it has been stored for a long time, it may differ from a brand-new item. I have carefully inspected it, but there might be some oversights, so please enlarge the images to check the condition thoroughly. There are fold lines. Please purchase this item if you are not concerned about minor details. It will be shipped folded in half or in quarters.