Strathmore Announcement Size Creative Cards are perfect for creating formal announcements, invitations, change of address cards and thank you notes. The paper is 80 lb (216 gsm) cover with an excellent texture; perfect for colored pencils, rubber stamps, collage and more. Announcement Size matching envelopes are 3.625 x 5.125 inches. These cards meet domestic size requirements for 1st Class US Mail. Pack of 10 cards.