They are [4" x 6" glossy photos](https://www.inmateaid.com/letters) that are prison approved and are printed to the edge without a white border. They are absolutely the best quality you can get.
https://www.inmateaid.com/ask-the-inmate/how-big-are-the-photos-i-send-from-inmateaid#answer
Accepted Answer Date Created: February 22,2016