These are strings for acoustic guitars and are professional acoustic guitar accessories with good sound transmission.Advantages: 1.E-1st, B-2nd strings are nickel-plated steel wire smooth strings. G-3rd, D-4th, A-5th, E-6th strings are hexagonal steel core with phosphor copper alloy wound strings. 2.The strings are bright and smooth, with moderate hardness, which will not hurt your hands after long-term practice. 3.The strings have a pleasant sound, strong penetrating power and good sound transmission. The sound of the strings is pure, and the strings are wear-resistant and durable. 4.Each string has a brass bead end, which can lock the string end firmly, strong and stable. 5.These strings are suitable for acoustic guitar use and are suitable for performance use.Note: 1.Due to manual measurement, the size may be slightly different. Thank you for your understanding. 2.Due to different light conditions and different monitors, item color displayed in photos may be showing slightly different from real object.Specifications:Color: Silver + CopperMaterial:E-1st / B-2nd: Nickel-plated Steel Wire Smooth String, G-3rd / D-4th / A-5th / E-6th: Hexagonal Steel Core with Phosphor Copper Alloy Wound StringPacking Size: 13*11*1cm / 5.12* 4.33*0.39inNet Weight: 35g / 1.23ozGross Weight: 50g / 1.76oz String Diameter E-1st 0.30mm / 0.012inch B-2nd 0.40mm / 0.016inch G-3rd 0.61mm / 0.024inch D-4th 0.80mm / 0.031inch A-5th