Used string set. I usually replace them every 1-2 years. I'm selling three sets this time, and this set was replaced after one year of use. You might feel some roughness, but I think they're still usable. If you like the mellow sound of Spirocore strings, this is for you! I switched to light tension strings, so I'm selling several sets of medium strings that I had after replacing them. Due to the nature of used items, no claims or returns are accepted to prevent swapping! I will ship them together in one bag! - Brand: Spirocore - Instrument Type: Contrabass - String Type: Spiral Core - Gauge: Medium - Thank you for looking.