I bought this string set for my daughter from Shar (cost 20% less than at the nearest shop), and had the strings replaced by the luthier since we had to pickup her re-haired bow anyways. About a week into practicing, my daughter discovered all four strings
were unravelling at the bridge. I immediately took photo, and notified Shar. After few days, they shipped replacement set with email notifying me to lubricate the grooves on the bridge, which is a common knowledge. Once the replacement string set arrived,
my daughter replaced them (of course, lubed the bridge and the nut grooves). After a week of practice, she discovered E string unravelling at the bridge again, and buzzing noise from A string. We couldn't find the source of the noise. With All-State competition
around the corner, we panicked our way to the luthier (3 hours round trip). After an hour, the luthier pointed out that A string, although looks fine, was the source of the buzzing sound. The shop had Eva Pirazzi in stock, he replaced them, and the buzzing
sound went away. Luckily, we still had a week for the strings to settle in, and proud to say she made to the All-State. Evah Pirazzi strings became my daughter's favorite few years ago, and the only strings she had used since then. She has never had an issue
with Evah Pirazzi strings, until these two sets. It's unusual to have two sets of defective strings back to back. Perhaps, Shar got a bad batch of them, no fault of Shar.