Phosphor Bronze acoustic guitar strings, offering a warm and bright tone. Unused, but purchased 5-6 years ago. The packaging has some dirt. I opened it to check the contents just in case. No noticeable rust is visible from the outside of the packaging, but there is a possibility of oversight. Please refrain from purchasing if you are concerned about minor details. Thank you for your understanding. There are also sticker removal marks on the bottom front. Will be sent in simple packaging via Yu-Packet Post Mini. - Brand: D'Addario - Model: EJ26 - Type: Custom Light - Gauge: .011-.052 - Material: Phosphor Bronze - Tone Characteristics: Warm, bright, & balanced tone - String Color Code: Silver, Purple, Green, Black, Red, Brass - String Diameter: 0.011, 0.015, 0.022, 0.032, 0.042, 0.052 Thank you for looking.