Product Description: Advantages: 1.Every product has a unique Manufacturing Part Number label on the inner package that proves it has been qualified,which include Part Number,Model Number and inspection date information 2.If you have any questions about the item,please provide us the Manufacturing Part Number for checking,your profits will be guaranteed.3.Universal Strings are a good solution to enable you to replace single bass strings when you don't need to replace the whole set.4.Our piano strings can replace any broken piano strings.5.Our product can replace old strings in pianos, and it also avoids the inherent tuning instability of new strings. Specifications:Material:Steel WireColor:SilverSize:100x0.0775cm/39.37x0.03inch(TLxD)model:13 Total Length: 1mDiameter:0.775mmWeight:20g Package include:2 x Piano strings 13 1M