Used Contrabass Strings Set of 4 Spirocore Spirocore 3/4 Light E, A, D, G set. Used for about 6 months recently. Non-smoking environment, no pets. There is fraying on the felt at both ends, but no bending or breakage at the contact point with the bridge. I think they can still be used. They are standard Jazz strings, but I think they can also be used for classical and other genres. The package is dirty. Please judge the condition by looking at the photos.