This is a set of D'Addario Zyex light gauge contrabass strings. They are used. I bought them new and had them on my instrument for about 4 months. When they were new, they had a bright, metallic feel, but now they've settled down quite a bit and are easier to use. I think they still have plenty of life left in them. They also have a nuance similar to gut strings, and I think they're good strings with a moderate tension. I'm selling them because I switched to different strings. Zyex strings are sold at Soundhouse for 25,500 yen including tax. How about it if you want to try them? The original bag is not included. This is a sale of the strings only. Thank you.