Since this seems to be the biggest concern from people that I've read about these strings, I thought I would address this first. I began using the La Bella Folk Singer 830s a long while ago on an older nylon string acoustic I owned, but stopped doing so because the black treble strings seemed to die out into a dull plastic sound very quickly. I do not know if the black treble strings in these 900-B string packs are distinct from the 830s or if the company now manufactures them differently, but I have gone through three packs of these 900-Bs and have yet to run across that problem.

I was first interested in polished basses when I started experimenting with using a plectrum with nylon strings and wanted to get as close to a flatwound, non-aggressive pick attack for jazz as possible. I was not disappointed when I installed them. When it comes to feel and sound, I would say that (and I take great artistic liberty here) for a nylon string acoustic these are the equivalent of D'Addario Chromes. Performing non-muted sweeps with these strings is a completely unique experience. Hearing this statement would make any jazz guitarist guffaw, but the sweetest and warmest tones that I have ever pulled out of any guitar were on my beater entry-level Yamaha NTX1 and these 900-Bs through a solid state amp. I look forward to trying this with far better gear and tubes.

They settle very quickly, so far for me it's only taken about two or three hours to get them fully stretched and they also maintain their tune well into their lifespan. You will end up restringing because you've played them dead before they become a tuning liability.

Cleaning these strings is also just as a breeze as it is to clean flatwounds, and using even just a Miracle Cloth for a minute or so will render them iridescent and more polished than factory.

I believe the primary purpose for these basses is to reduce squeaks from the neck-hand, and succeeds. Were I playing fingerstyle I would need a better bout-hand grip and would avoid these strings in favor of the regular winds or even the flamenco reds from this company, but when using a plectrum I don't think I will ever use another nylon string.

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I recently bought a classical guitar for some parts in the guitar symphony I am writing for my wife, and I was absolutely stunned by the change in tone, and playability that these strings provided over the D'Addario strings that came with the guitar.

The flamenco part for the symphony now sounds so much more robust, and the tonal bandwidth is great. I will likely buy these again. I also bought some other sets, to experiment with what works best for me, but so far I am extremely pleased with this set.