This folio (here, you see the outer wrap) contains four unmailed maximum cards that can be described as embossed woodblock, each with an engraving and–along with the engraving on the front–an equivalent stamp with 2007 postmark.  See entry 20307225B for an example of one of the cards.  These were issued by the China National Philatelic Corporation, and there’s a historical description in Chinese and English on the reverse of the folio cover.  Grade: 1