Were all of these strings used by Elyse Miller?
No, not all of the strings were used by Elyse. The description will specify whether or not that specific piece contains Elyse's strings. Some strings are upcycled from Spotlight Music, a local music store.
Why used strings instead of new strings?
Using old strings gives them a second life when they would otherwise be thrown away. Reduce, reuse, recycle! It's also way more personal and real. New strings aren't very musical; they've never even made a sound! Used strings have a history, a character, a song! Don't worry, the strings are cleaned before they are made into jewelry.