They are costly but in my opinion they are worth it. I have been using Elixirs 45-105 for years now on my 6 basses and have tested some others (Daddario, Fender) in between but always returned to these Elixirs. They sound great, they are stable (don't change sound after 3 or 4 gigs) and they last. No I am not endorsed, after dozens of sets of Elixirs it was about time to write this review.