this are okay strings, after 2 months of 2 hrs of use a day sometimes weekends and concerts, the sound quality has drop so much that im considering change back to my previous strings.after 2.5 months the responsiveness has drop substantially as well, from needing almost no rosin (i use hard rosin) to now have to pass my bow through my rosin 10 times Mondays and Thursdays, to the point that is bad for the bow.at first the scratch was almost non, now, i scratch all the time with a moderate quality viola, 100 bucks bow, 30 bucks bridge, and 20 bucks rosin.i wont buy it again, is fine if you can change the strings every 8 weeks