expensive, but for classical concert guitars

I use this special-steel strings on my guitar sound (of Folk Friends, see photo), which is usually fitted with nylon strings and for the same voltage as "Spanish" classical guitar is designed. Who simply rearing Western strings on a classical guitar, risking tool damage - because Westernklampfen have inside with webs amplified sound ceiling and therefore tolerated not only train but also sound different.

The Thomastik KF110 are among the very few steel strings, I could find for classical guitar at all (the others are Optima Bergfee strings 'wandering guitar', which I clearly can not recommend), because they have much less power than Western strings. I just needed more volume with my guitar, because I often play in well-filled RPG taverns where I need as much sound pressure as my voice will bear to enforce me audibly - and with nylon strings I hear sometimes their own guitar not. The Thomastik strings fix exactly, because especially the typical harmonic spectrum of steel strings provide for more transparency and assertiveness in tone. The strings sound beautiful and are playing clean through the "Flatwound" -Glattschliff in single picking.
One must, however, still make it clear that more and more steel train means as nylon, even in these strings! The acoustic ceiling my lute is indeed curved recognizable (if you flat over it looks), and I have had in the last year to repair a small crack between body and bell blanket - however get my instrument well as some impact from, because I'm usually in well-filled spaces between the rows of seats on the road, and also with humidity it has to deal. So stop is the life of a Lagerfeuerklampfe ;-) That said, I'm not assuming that the strings have caused the damage, because since the repair is quiet again.

These strings are also tremendously in tune: Where you have to readjust at least one week every day with a nylon set after first raising the high E string, the KF110 remain on the first day voted clean. Also, my first sentence has held for almost a year, until I have torn me in frenetic game for a howling mob the top E string - at the time I had, however, already strummed my Klampfdaumen bloody and the voice broke slowly; under such conditions may sometimes an 11-month-old string tear. Was a good evening ;-)

Only the high price may deter, but who (like me) wants to have steel strings on a classical guitar, will find nothing better. Strong buy recommendation.