This feature is used to immunize a wide range of products and documents such as (bank cheques, academic certificates, coupons, lists, official government documents, visas, birth certificates, marriage contracts, death certificates, deeds, wills, land registry documents, government employee identities, gun badges, private place entry badges, company registration certificates, security license certificates, local products manufacture corporate letters in all fields, as the type of adhesive is thermal and strong enough that it cannot be removed and leaves no burr; this feature can be used to immunize all documents and letters that you issue.