I've used Labella black tape wounds for around 15 years, on many different basses - Warwick Thumb, Jazz, Precision, Jack Casady signature, Ritter Cora and on. They feel great under the fingers, enabling playing that wouldn't always work with standard round wounds. They don't cause fret wear and are easy on the fingers. The sound is warm and round, with good bass and a midrange that really cuts through. They may not be the best choice if you favour the bright modern active sound. Surprisingly, they can do a good old-style slap sound (think Larry Graham), but they do best at classic old-school bass sounds. They also last a long, long time.