Real Postage Stamps: These are real postage stamps that can mail letters, envelopes, and others, They can cover the international rates the first time, USPS serves any country with a one-ounce letter. One stamp is one ounce. Forever Stamps: These postage stamps are valid USPS forever postage stamps that can be used at any time, you can send mails no more than 1 ounce by USPS. Saving Your Time and Money: No need to waste your time and money on the way to the post office for stamps! Our postage stamps are very convenient and also at a nice price! Easy Use: With self-adhesive, convenient to use. Not only great for postcards, letters, mailing envelopes, or collecting but also suitable for collectibles, birthdays, weddings, parties, celebrations, and so on.