Tight string winder technology Proprietary rust-proof coating Feel smooth High quality sound colour:Silver + yellow Material:stainless steel size:10*10cm E-1: 0.010 inch,0252mm E-2: 0.010 inch,0252mm B-3: 0.014 inch, 0.36 mm B-4: 0.014 inch, 0.36 mm G-5: 0.023inch, 0.56 mm G-6: 0.010 inch, 0.20 mm D-7: 0.030 inch, 0.76 mm D-8: 0.014 inch, 0.30 mm A-9: 0.038 inch, 1.02 mm A-10: 0.018 inch, 0.46 mm E-11: 0.047 inch, 1.27 mm E-12: 0.027 inch, 0.66 mm Package Contents: 12x Guitar Strings Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.