Please read this information together with all scans between this one and 20307542.  That should explain almost everything.  Then, if you have any question, ask us.

This is a series of 42 unused cards issued by China Post and showing various events and symbols associated with the 16th Asian Games in Guangzhou in 2010.  Some of these cards are about these specific games, and some are about earlier or related events.  All cards are Grade: 1, and the price per card is US$3.  The card you see in this scan was #1 in the series, though this specific card has been sold.