Thank you for viewing. FERNANDES ZO-3 dedicated strings, GSZ-500. Although unused, the 1st string is missing, so it's a set from the 6th to the 2nd string. These strings were planned and developed specifically for the ZO-3 scale. They cannot be used on other guitar scales. Due to long-term storage at home, there may be some string degradation, but there doesn't appear to be any severe rust. Please refrain from purchasing if you are concerned. This item will be shipped via regular mail (fixed or non-standard). We are not responsible for the delivery status or any guarantees. Please understand this before purchasing. * Regular mail does not deliver on weekends and holidays, so it may take some time. * Please refrain from negotiating the price of this item. Fernandes Zo-san Electric Guitar