# Mail piece design specs

Browse our available mail formats and associated design specs:

<table data-view="cards"><thead><tr><th></th><th data-hidden></th><th data-hidden></th><th data-hidden data-card-target data-type="content-ref"></th><th data-hidden data-card-cover data-type="files"></th></tr></thead><tbody><tr><td><strong>Postcards</strong></td><td></td><td></td><td><a href="/pages/GWubpwyedg0alyyK2mRa">/pages/GWubpwyedg0alyyK2mRa</a></td><td><a href="/files/qBZGfylgcvyBwceNNlYo">/files/qBZGfylgcvyBwceNNlYo</a></td></tr><tr><td><strong>Self-Mailers</strong></td><td></td><td></td><td><a href="/pages/yrDIE0z5ZKKC6hAJiewV">/pages/yrDIE0z5ZKKC6hAJiewV</a></td><td><a href="/files/IReQR6xuXzzv2NzyswBo">/files/IReQR6xuXzzv2NzyswBo</a></td></tr><tr><td><strong>Letters</strong></td><td></td><td></td><td><a href="/pages/cPHp1Lorv4H0OViiHVSj">/pages/cPHp1Lorv4H0OViiHVSj</a></td><td><a href="/files/WQD8C5I7JzDKc0QYMP6S">/files/WQD8C5I7JzDKc0QYMP6S</a></td></tr><tr><td><strong>Letter Envelopes</strong></td><td></td><td></td><td><a href="/pages/L4f1xCMRIpu86aOFZVOq">/pages/L4f1xCMRIpu86aOFZVOq</a></td><td><a href="/files/Bn6QSwAKmrUKncHW8zkj">/files/Bn6QSwAKmrUKncHW8zkj</a></td></tr><tr><td><strong>Letter Add-ons</strong></td><td></td><td></td><td><a href="/pages/kuzeeEdjdMoes1rnxAw4">/pages/kuzeeEdjdMoes1rnxAw4</a></td><td><a href="/files/W4l61Q2d7Yg88vGkMsWp">/files/W4l61Q2d7Yg88vGkMsWp</a></td></tr><tr><td><strong>Checks</strong></td><td></td><td></td><td><a href="/pages/O902fvgHETMFM8VP8V5C">/pages/O902fvgHETMFM8VP8V5C</a></td><td><a href="/files/gma03AsH6FIUK5iJpLtB">/files/gma03AsH6FIUK5iJpLtB</a></td></tr><tr><td><strong>Snap Packs</strong></td><td></td><td></td><td><a href="/pages/cTdYit7N0DPaVrg9cVJd">/pages/cTdYit7N0DPaVrg9cVJd</a></td><td><a href="/files/fxEzEvpMiAeKJC0WjVOH">/files/fxEzEvpMiAeKJC0WjVOH</a></td></tr><tr><td><strong>Booklets</strong></td><td></td><td></td><td><a href="/pages/KKoAYtKPjQwVjFZO3bfN">/pages/KKoAYtKPjQwVjFZO3bfN</a></td><td><a href="/files/9TPnIXBgakQoRsnh8qg2">/files/9TPnIXBgakQoRsnh8qg2</a></td></tr><tr><td><strong>Custom Mail</strong> </td><td></td><td></td><td><a href="/pages/xwCE4qpEv6p1L0iwisqY">/pages/xwCE4qpEv6p1L0iwisqY</a></td><td><a href="/files/B3HrXLhK1mwu7WOW0dXR">/files/B3HrXLhK1mwu7WOW0dXR</a></td></tr></tbody></table>


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://help.lob.com/print-and-mail/designing-mail-creatives/mail-piece-design-specs.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.