This is a used set of Spirocore contrabass strings. The G and D strings are medium gauge, and the A and E strings are light gauge. They came with an upright bass I purchased used, so I don't have detailed information, but their condition is not too bad. They may be 1-2 years old, but it's likely they weren't played much. There are no signs of kinks or rust. They don't feel unnaturally stiff, so even though they aren't like new, you should be able to use them without much concern.