Digital BW, The Print

Hello Mark,

Museo offers matte, two-sided printable, pre scored cards with envelopes in a square format. I have used these cards in several formats. The profile leaves something to be desired, but the paper is elegant.

http://www.museofineart.com/index.php/products/

http://www.bhphotovideo.com/c/product/631235-REG/Museo_09795_Inkjet_Artist_Cards.html

Please note that square format cards require extra postage. They are expensive to mail. 

Good luck!

Christy