Hahnemühle Watercolour Postcards in a stylish box

Watercolour painters send their greetings... with individual watercolour postcards. The postcard box contains 30 postcards 10 by 15 cm for creative souls to capture holiday impressions, painting greeting cards or invitations. The postcards are provided with an address filed on the reverse side ready for posting. They are packed in a high-quality metal box (with changing images). Acid free and age resistant.
Thanks to Antonio Valiente for broadcasting this video.

[xx_PCCR_xx]

0:51 I like the texture of this paper. What type of paper is it? Can it only be purchased in this postcard format?

[mikel]

So, acid free, but not 100% cotton rag. Pretty stiff price for plain old paper no matter what the weight.