Used set of Spirocore double bass strings. The G and D strings are medium, and the A and E strings are light. I'm not sure of the details as they came with a used upright bass I purchased, but the condition isn't too bad. They may be 1-2 years old, but I think they weren't played very much. There are no kinks or rust. They don't feel unusually stiff, so while they're not like new, I think they can be used without much concern.