Martin MA140 Light (12-54) - acoustic guitar strings

4th string gauge: 0.813 mm (0.0320") 5th string gauge: 1.07 mm (0.0420") Strings gauge range (Min - Max) (imperial): 0,305 - 1,37 mm (0.0120 - 0.0540") 1st string gauge: 0.305 mm (0.0120") 2nd string gauge: 0.406 mm (0.0160") 3rd string gauge: 0.635 mm (0.0250") String winding material: 80/20 bronze 6th string gauge: 1,37 mm (0.0540") Suitable for: Acoustic guitar Quantity per pack: 6 pc(s) Warnings: Use as intended.