I just bought a used bass from Guitar Center online (Corpus Christi store) and they said they had just put new strings on it. I took them off because I wanted to use other strings on that bass, but decided to put them on another bass. These strings sound great on that bass. They have black silk on both ends and are nickel rounds. I assume they are not an expensive brand, since I think GC would have just put on whatever cheap strings they had. Any ideas what they could be?