These stickers are likely from about 20 years ago. They are a partially used set, stored at home without the outer packaging. The adhesive strength is unknown. As shown in the photos, some stickers show signs of having been peeled off, and there are also traces of something having been attached to the back of the backing paper. Please refrain from purchasing if you are concerned about this. I believe these stickers are no longer sold, but they are old, so please check the condition in the photos before purchasing. I do not plan to sell these individually. Instant purchase is welcome! They will be shipped in an envelope with waterproof packaging.