Specifications:Features:- Tone color is thick.- Strong durability.- The surface of the alloy is multilayered.- Long time is not oxidized.- Suitable for senior guitarists.Model: SA-37Inner Material: Six Angle Steel CoreExternal Material: 90/10 BronzeColor: As picture showsSize:- E: 010 inch / 0.25 mm - B: 014 inch / 0.36 mm - G: 023 inch / 0.58 mm - D: 030 inch / 0.76 mm - A: 039 inch / 0.99 mm - E: 050 inch / 1.27 mmPackage Weight : 45 G / 1.59 OuncesPackage Dimensions (L*W*H) : 125*110*5 MM / 4.92*4.33*0.20 InchesRetail Packaging: No, No PackingPackage Include:1 x 6pcs/set Guitar Strings