These strings were used for approximately 3 months, starting May 19, 2025. There is no rust or fraying. These are recommended for those who want to experience the familiar sound of Peter Infeld strings, or as spares in case a string breaks, as they are in a stable tuning condition. Peter Infeld strings have a relatively long lifespan, so I think they can be used for another two months or so without any problems. No claims and no returns, please.