Please note carefully: these are stamp cards, not postcards.  The cover measures about 8-3/4″ x 11-5/8″ and the four cards themselves (see 37100030B) just slightly smaller.  The  cards represent Basketball, Fencing, Sailing, and Artistic Gymnastics.  About half of the reverse of each card (which, you’ll see, are designed as Maximum Cards) is taken up with captions in Chinese and English about the history of this 2006 stamp issue, and of the individual sport.  You may also see two small parallel red lines on the top part of the cover.  That is the original price sticker with the RMB price deleted.  We don’t want to disturb the cover by trying to remove the sticker, but you might.  Hard to grade, but to be safe we will call these Grade: 2.