Endicia NetStamps Labels Postage Sheets / 20 Stamps Sent FC Large Envelope IF YOU TIN YOU GET TWO (2) SHEETS INSTEAD OF 1! NetStamps for Stamps.com is a perfect way to send all your letters, postcards, and flats They never expire, so print, peel, stick, and go at your own pace Valid for use with domestic or international USPS First Class Mail, when mailing letters, postcards and flats or large envelopes. Netstamps have no date or domestic address restriction Fluorescent watermarked, ensuring the security of your postage Note:-- NetStamps are not authorized for use on Packages, Priority Mail or Priority Mail Express per USPS regulations