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The Rotosound Black Nylon strings are flatwounded and covered in black nylon so it has a smooth and satin touch, plus an edgy look, very pleasant if you are not used to normal wounded e-bass strings which can blister your fingertips, this is probably a close emulation of the touch of a double bass. The most interesting aspect is the sound, placed on a e-bass it delivers a smooth sound, with slightly less gain and sustain probably due to the nylon surface, but this helps in bringing the sound closer to an acoustic bass. I'm using (and recommend) them to play Rock music.