Pirastro Jazzer strings are very easy and gratifying to play - good sustain, great left-hand feel, and a round, fat tone. It's a set that not everyone seems to know about, but players who've tried them are usually very enthusiastic. Steel-rope core, so they are durable, but they don't feel tight or stiff. Extremely reasonably-priced for the quality. They respond WELL to the bow - not exclusively a pizz string!