Using them on a passive Fender Jazz. I was using mostly Daddario EXL strings in the past, they were ok, but these Elexir strings are great! I know, that EXL is nickel and these Elixir are stainless steel, but the overall sound is more focused and feel is much better, easier to move around, personally to me. And they stay fresh for a really long, long time! Love it!