 The number of coins in a single string was locally determined as in one district a string could consist of 980 cash coins, while in another district this could only be 965 cash coins, these numbers were based on the local salaries of the "qiánpù".During the Qing dynasty the "qiánpù" would often search for older and rarer coins to sell these to coin collectors at a higher price.Prior to the Song dynasty strings of cash coins were called "guàn" (貫), "suǒ" (索), or "mín" (緡), while during the Ming and Qing dynasties they were called "chuàn" (串) or "diào" (吊).