Thomastik-Belcanto D and G string set. I bought them new and used them for about a year. They were strung on a standard 3/4 size bass. They have a much softer tone compared to Spirocore strings. The tension is also lower. There is some fraying on the silk windings, but I don't think it affects the playing at all. These are used strings, so please consider them as junk. No claims accepted.