Some time ago I fell in love with the sound of flatwound mandolin strings and started using the Thomastik sets. Unfortunately the price of those rose so high I had to give them up - and switched to these and never looked back.
These are brighter sounding than Thomastik's but may still sound dull to those used to roundwound PB strings. They also have a plain A string unlike the wound A on the Thomastik's.
For me these are simply the best sounding affordable mandolin strings out there. However, the flatwound sound is an acquired taste that's not for everyone.
These are also long lasting strings, I typically have them on for around 6 months before changing, and they get a fair hammering every single day too. The only thing I've found is that the plain strings, especially the A's start to loose their sweetness after about a month or two. As a result I will change the plain strings more often - these can be bought as singles cheaply almost anywhere.
I like these strings a lot. They have a distinctive sound quality - punchy, not twangy, mellow rather than bright. In guitar terms, a bit more like the sound of an arcthop jazz guitar rather than a flat picked dreadnought. For this very reason I suspect that they will not be for every mandolin player.
They come up to tune very quickly and don't need time to play in - ie. to lose that hollow sound that so many new strings have. I think this is connected to their distinctive sound quality - their sound emphasises the mids rather than the trebles and basses.
Perhaps surprisingly, they are very responsive - hammer-ons, pull offs, grace notes and especially slides all come out much more easily than with roundwound strings.
There is one downside - the strings are far heavier than I expected and are pretty hard on the fingers - this somewhat counterbalances the ease of play (slinkiness is the usual word) that one would expect from flat wound strings. I'll see how I feel about this in a few weeks time and if I haven't got used to it might look into lowering the action a bit.
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