After getting some great advice from the "JustStrings.com" bass strings specialist/guru. I decided upon these "D'Addario ENR73 Bass Strings" for my "RogueÂ® LX200BF Series II, Fretless Bass"!
Due to my style of finger-sliding, owing to freak-en arthritis, they play fairly quiet on my inexpensive, no fret lines, bass. They are first-class, killer strings!
The sound has kind of a "thumpy" tonality on the lower register, yet a "clean, bright coloring" in the upper. This is something you usually don't get on a fretless. ???
I highly recommend these strings and the cool folks at "JustStrings.com"!
Enjoy them, people...