Postage stamps that USPS currently offers for 3-ounce envelopes. Typically, a 3-ounce envelope includes a save-the-date card or an invitation card with a reply & details card in 236# stock, or an invitation card with a reply & details card in 118# stock with multiple embellishments. Please contact us if you have questions regarding postage. This item includes assembly and must be purchased with invitations or save-the-dates.