100 Forever postage stamps Forever stamps will always equal the first class rate Coinciding with the 50th anniversary of Earth Day, the stamp features a playful painting of the planet, with small green lines surrounding Earth and hand-lettered text. Always equal in value to the current First-Class Mail one-ounce rate. Easy to use Peel-n-Stick - Self Adhesive no Licking. This beautiful stamp can be used on RSVP envelopes often enclosed with wedding invitations, party invitations, thank-you notes, announcements, or any other correspondence.