Four chinese characters / Blank. The size is about 24-25mm, the weight is 3 to 4 grams. Various types, all are uncleaned. The price is for the exact group of 10 coins shown above.

The Song Dynasty was a ruling dynasty in China between 960 and 1279; it succeeded the Five Dynasties and Ten Kingdoms Period, and was followed by the Yuan Dynasty. It was the first government in world history to issue banknotes or paper money, and the first Chinese government to establish a permanent standing navy. This dynasty also saw the first known use of gunpowder, as well as first discernment of true north using a compass. 

The coins are unconditionally guaranteed to be authentic.