These are handmade shaker stickers. They are approximately 2.5cm in size and come in a set of 8. They are rare as they are not commercially available and are very popular for children's sticker exchanges! These are hard case stickers that do not dent when pressed. The capsules are glued shut and cannot be opened. The back is made into a sticker with adhesive. These are handmade items, so please only purchase if you understand this.