Steel makes sense for extreme durability - I suppose you could use extremely thin steel wire for in-ears to make it flexible, though it might require a very spe

Steel makes sense for extreme durability - I suppose you could use extremely thin steel wire for in-ears to make it flexible, though it might require a very special alloy to be thin and low resistance? In my experience, litz wire is exceptionally flexible and suitable for getting shoved in a pocket frequently. Each wire can be quite thick due to the flexibility.