Reproduction feldpost censor seals. These would be used by the military censor to reseal opened envelopes and boxes. The back is coated with a water-activated adhesive like a stamp but we recommend using water and probably avoid licking it. These are press-printed and the ink will not fade or bleed. The labels measure approximately 4" long (some may be slightly longer or shorter).
These are sold in sets of 3 or sets of 25.