That’s somewhat of a loaded question as there are many ways/services to delivery your invitations. We offer two types of packaging, which we recommend, to protect and delivery your metal invitations. The first envelope is an A4 size – this holds your invitation tight, but doesn’t offer the rigidity needed for shipping. The second envelope is a ‘rigid mailer’ – a harder, flat envelope in which you will insert your metal invitation in the previous A4 envelope. Together, this combination should ensure your metal invitations arrive in good condition. Most of our clients ship their invitations through USPS in the envelopes noted above. Because the invitation is rigid, the postage must be hand-cancelled. This can raise the price to roughly $2-3 postage per unit; however, we ask that you please contact your local Post Office for exact cost from your location to your guests. WEIGHT: 3 to 5 ounces DIMENSIONS: 9 X 7”. PLEASE NOTE THESE ONLY FIT OUR STANDARD 4 x 6 in. invitation.