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Is there nickel in M Steel ?

There is no nickel in the...

Stainless Steel Slinkys
Cobalt Slinkys

The M-steels have nickel only in the core of the wound strings, which don't come into contact with fingers and don't cause problems.

See here...
http://forums.ernieball.com/ernie-ball-strings/56790-steels-post943846.html#post943846

Remember that guitar frets are most often made of nickel silver, which are approximately 60% copper, 20% nickel, and 20% zinc (and 0% silver, oddly enough).
 
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