These are Spirocore Light strings for double bass. I purchased them around the latter half of the COVID-19 pandemic and used them for live performances. (I checked the purchase date, but I couldn't find the exact year and month.) I've replaced them, so I'm putting them up for sale. They should be in usable condition, but they've been used for a few years, so there is some wear and tear. Therefore, I've listed them under the "used" category. Please consider this before purchasing. I don't have the Spirocore box, so I will ship them bundled in the E string packaging.