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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 great discounted price. 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 many more event and marketing material mailings!