Mark takes a look at the PRS John Mayer Silver sky.
PRS Silver Sky John Mayer, Frost - http://po.st/J6MFqU
PRS Silver Sky John Mayer, Tungsten - http://po.st/D0cBIY
PRS Silver Sky John Mayer, Oynx - http://po.st/BPXUyL
PRS Silver Sky John Mayer, Horizon - http://po.st/Z8OIgr
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