This is a Topvalu diatomaceous earth dehumidifying sheet, double size. It has a humidity sensor that changes from blue to pink, indicating it needs to be dried in the sun, and can be used repeatedly. It can also be washed. I have used it a few times, so please consider this before purchasing. There are no noticeable stains. Size: Approximately 129 x 180 cm It will be shipped via either Yu-Yu Mercari Bin or Kurakura Mercari Bin. Thank you for looking.