No Expiration Date - These stamps have no expiration date, twhich makes them ideal for both business and personal, these stamps presently hold the legal tender status for postage and are guaranteed to remain valid indefinitelyBrand New - Each stamp within this assortment features a unique QR or barcode system, providing enhanced security against counterfeiting, hold the legal tender status for postageProviding Speedy and Reliable Delivery - Using 1st class stamps is the quickest way to ensure your letters and parcels are delivered to their desired location within the quickest possible time, for all your postage needsParcel - Each postage stamp can be used for standard-sized letters, change-of-address cards, postcards, parcels and similar items, valid for items up to 100g in weight and 240mm x 165mm x 5mm in sizeService - We are committed to providing our customers with reliable products, if you have any questions about our products, we will respond to you within 24 hours on weekdays