Moisture Indicator label rolls. 500 labels/roll. 6" X 5.5". Paper labels with permanent adhesive. Black and red. To protect your product/cargo from getting wet, you need this irreversible moisture sensitive label. When a package with this label comes in contact with water, the black ink will run or bleed. Adhere this label to the outside of your package for high asset products to ensure shipping quality. Ideal for rail cars, freight trucks with metal or any other product that cannot get wet.