I put them on my fretless Stingray 5. Hot damn these are big strings: .135 B, .115 E, .100 A, .75 D, .65 G. These are probably the biggest strings I've ever seen. The set I had on previously was a fairly light set of GHS flats. They were alright.. the only real problem I had with them was that the G sounded weak compared to the rest of the strings and everything was a wee bit thin on the whole. These Rotosound Tapewounds are pretty much everything I wanted out of a string for this bass. They sound HUGE, have a really nice character to them, and my weak G string problem is definitely fixed. I'm really impressed with them. This bass was pretty loud before but now it has a ton of output. My B and E were good before, but now they're great.They also feel very nice. My bass has a switch which toggles the pickup between series, single coil (with a hum cancelling dummy coil), and parallel. With the other strings this switch didn't seem to do much. With the Rotosounds the 3 modes are much more distinct.. which is definitely a plus. Oh yea.. and my bass looks awesome with black strings. I can't wait to try these out with the band.