D'Addario EJ45 Pro-Arte Classic Normal Classical Strings

Strings sounds good and easy to install. Play action is good also.

I presume these are designed and tested by engineers and there are many variables that may account for my experience. My experience was that EAD the metal wound strings were quiet compared to the clear nylon. I think these lower frequency strings should have more tension or less stretch so they are louder.
The Pro-Arte strings came on my Portugese all solid wood cedar top classical with firm tuning gears. It took several tunings before the the strings settled down. I got it the day after Christmas and it still lost a semi-tone of pitch from last week. I think they finally hold pitch. Their surface is too smooth and slippery to hold a knot. I worried that the strings would snap out of their harnesses. They didn't but perhapes the company can experiment with special texture or rosin on the knotted section of the string to grip saddle and tuning pegs.

One the positive they are very flexible and stretch a mile.

I will play these strings real hard to work in my newly made guitar and later try a set which is the next gauge up.
This is 19 days into breaking in on both strings and guitar. I will edit this if the the strings ware unevenly and will keep them in constant EAD GBE tune until standard tune Egan values have worn into the varnish indicated hopefully by a noticable increase in volume.

These are very good strings for the price. I was a dissappointed in the sound transition from the nylon to the wire wound nylon. It seems the wire wound are a little too bright and the nylon are maybe too soft. This makes the move from the D to the G string too noticable. But again - the price is right.

These are good strings for the amateur or student classical guitarist. You can't beat the price vs performance. One nice thing about these strings is that they are packaged in an air tight bags filled with an inert gas which inhibits corrosion. So if you buy several sets you won't have to worry about them while they sit in a drawer for months.

Strings arrived quickly and they sound great on my classical guitar! good job folks.