Sometimes used as a workaround size for printers that don't natively support A7 dimensions. Other Potential Matches
, it uses that requires special heat-sensitive paper rather than standard ink cartridges. Paper Type: 2" x 3" Zink Premium Photo Paper A77zip
If you are printing cards, the standard A7 envelope fits a 5" x 7" card. Sometimes used as a workaround size for printers