A4 Contour Flap Envelopes (4 1/4 x 6 1/4) - Ruby Red (50 Qty) | Perfect for Invitations, Announcements, Sending Cards, 4x6 Photos | EX-1872-18-50 Size: A4 Contour Flap Envelopes / 4 1/4 in x 6 1/4 in / 4.25" x 6.25" / 121mm x 165mm Quantity: Pack of 50 Color: Ruby Red USES: Invitations, Announcements, Holiday Cards, Greeting Cards, 4 x 6 Cards, 4 x 6 Photos, Letters, Personal Mail, Direct Mail. EVENTS: Weddings, Parties, Holiday, Corporate, Banquets, Showers, Birthday Printable on off-set printing presses and some home printers.