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A letter-size mailpiece, with one or two attached release cards, must have the following characteristics:
- The piece must be between 8" and 9-1/2" long (inclusive). With one release card affixed, the piece must be between 4" and 6" high (inclusive); with two release cards affixed, the piece must be between 5-1/2" and 6" high (inclusive).
- No address element, including any address block barcode, may be closer than 1" to the right edge of the mailpiece.
- The surface smoothness must be a maximum of 190 Sheffield Units.
- Enveloped letters must be made of paper with a minimum 60-pound book-grade paper and have a maximum thickness of 1/8". Window envelopes must have only one closed panel address window, no larger than 1-1/2" x 4-1/4".
- Card-type letters, not mailed at card prices, must have a maximum thickness of 0.025" as mailed.
- All pieces other than enveloped letters and card-type pieces (such as folded self-mailers and booklets) must have a maximum thickness of 0.1" as mailed. Mailpieces with two affixed release cards must meet the following additional conditions:
- Pieces requiring tabs must be sealed with 1-1/2" nonperforated tabs, unless larger tabs are required by standards for the specific mailpiece design.
- Booklets must have a minimum cover weight of 70-pound book-grade paper.
- Folded self-mailers must have a minimum cover weight of 100–pound book-grade paper.
- Content insert shift must be no more than 5/8" horizontally and no more than 1/4" vertically.
- Release cards must meet the standards in DMM 201.3.13.5.
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