This is a black floorboard used in tea ceremonies and other settings. The surface is in relatively good condition, and I believe it can be used without issue in a tea ceremony. Size Details: Length: Approximately 28.3 cm Width: Approximately 28.3 cm Thickness: Approximately 2.8 cm (Please allow for some margin of error) Regarding Condition [Please Read Before Purchasing]: Surface: Clean and glossy. Back: There are multiple scratches due to long-term storage. Please check the third image. (This part is not visible during use.) As this is a long-term storage item, there may be minor scratches or stains due to aging. Please purchase if you understand antiques and collectibles. In addition, please be sure to check the images for detailed condition and purchase only if you are satisfied. The items shown in the images are all that are included.