Product Contents: [Caution] This product will be delivered in the following 4 sets. The hidden label is black on the back of the label to hide information just by sticking it on your postcard and the printed underneath the label. Pre-printed pattern and cannot be printed on this paper. Product Specifications: Size: A4 Color: Blue; Label Size: Height 5.7 x Width 3.8 inches (144 x 96 mm); Label Thickness: 0.005 inches (0.12 mm); Other Specifications: Sheet Size: 11.7 x 8.3 inches (297 x 210 mm); Surface: 4 sides; Weight: 9.1 oz (231 oz (231 g); Note: This product is not guaranteed to completely protect your personal information in all conditions and specifications. ※This product cannot be printed on. This product cannot be used as a result of damage to the information surface when removing thin paper such as copy paper or rough surfaces. If the label is removed, a thin film will remain on the information surface. Cannot be applied on leather, wood, curved or uneven surfaces. Please note that when used on carbon paper or other materials may cause the print to fade due to chemical changes. ...