I love these strings, and will buy another set soon. My cello was built in Germany and finished in Minnesota by Andrew Fein. It was delivered with Larsen strings, and these were too bright for me. The synthetic core Amber strings are perfect. I have a friend nearby and have recommended them to her. In order to be kind to the A in this set, I start the day before and tune the A up to an E lower. Then after a few hours, up to F. Then the next day I tune it up to a G, and finally after another few hours up to the A. This works very well, and I am still able to practice every day if I need to. The Amber Strings have a warm rich sound and are much louder than I expected, loud enough to be comparable to any other strings.