These are extra-light coated acoustic strings made of Phosphor Bronze ☺︎ Using Ernie Ball's proprietary nanotechnology, both the core and wound strings are treated with a thin coating of less than 10 nanometers, providing a feel comparable to regular acoustic strings. Furthermore, it repels sweat, moisture, and finger oils that adhere to the string surface, ensuring a long life. Brand new and unopened. - Brand: Ernie Ball - Model: #2550 - Type: Acoustic Strings - Material: Phosphor Bronze - Gauge: Extra Light (10-14-20-28-40-50) - Features: Coated strings, improved durability Thank you for looking. ● To offer them at the lowest possible price, I use economical shipping and packaging methods. If you have any preferred shipping methods, please let me know in the comments beforehand ☺︎ ● We have started offering follower discounts and multi-purchase discounts! Please comment if you are interested ♪ #Acoustic #Strings #ErnieBall #ExtraLight #Everlast #ernieball #AcousticGuitar #komokomo