These are extra light coated acoustic strings made of phosphor bronze ☺︎ They utilize Ernie Ball's proprietary nano-technology, with a thin coating of less than 10 nanometers applied to both the core and wound strings. This provides a feel comparable to that of regular acoustic strings. Furthermore, they repel sweat, moisture, and fingerprints, resulting in a long lifespan. Brand new, 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 viewing. ● I want to sell these as inexpensively as possible, so I use inexpensive shipping and packaging methods. If you have a preferred shipping method, please let me know in the comments beforehand ☺︎ ● Follower discounts and multiple purchase discounts have started! Please comment if you'd like to take advantage of them ♪ #Acoustic #Strings #ErnieBall #ExtraLight #Everlast #ernieball #AcousticGuitar #komokomo