How to prolong the usable time of the strings? Here is our tips：
(1)Wash and dry our hands before playing the guitar. After finishing playing, using soft cloth to clean the strings.
(2)Use rubbing alcohol to wipe the strings from time to time.
(3)Loose the strings if we don't play the guitar for a long time.
If we keep a good habit, the strings can be used in a longer time. Then when should we change the full set of the strings?
If there is one of following situation, the strings should be changed with a new one.
(1)There are a lot of rusty spot or black dot on the strings.
(2)Feel it is not smooth and difficult to press when playing.
(3)There is abrasion on the part that touching the fret.
(4)Can't keep in tune when playing(Of course, need to make sure that it is not the problem of the machine head).
(5)Have been installed on the guitars for more than 3 months.
(6)Anyone of the strings has been changed before.