It's a new formula from pirastro, and the price was really tempting for me to try these strings
To begin with, I would say that they are somewhere in the middle of the whole sound spectrum, not overly bright or not overly dark.
They have a warm sound associated with most synthetics, and especially at the very first days they have an apparent shinny edge. The silver D could be one of the best in the set, though they sound full and even across the strings
The E string could be one of the most stable in the market
They can pretty much compare with the Thomastik Dominant in my opinion, so if you like Dominants you could give these a try.