mi sembra che sia una specie di cartone liscio, su cui puoi scrivere con il gesso e poi cancellarlo. Se preferisci puoi dire "cartone liscio"

vedi

Print This Article - CardMaker | Hand Crafted Greetings for ...
www.cardmakermagazine.com/printer.php?mode=article&article_...
They have products made from chalkboard cardstock called Chalkstock. This is as versatile as regular cardstock. You can cut it with a trimmer or scissors, or run ..

Mix Media - Discount Art Supplies and Art Materials from ...
www.texasart.com › Art Supplies › Paper & Boards › Paper
CANVAS CORP Home Basics Chalkstock
Chalkstock is an amazingly smooth surface that is perfect for chalk and wipe-off chalk markers, which can both be removed with a bit of moisture. Use the individually wrapped sheets as is to make a scrapbook page, cut up for canning labels, or insert into a picture frame to ...