EL-11102 Elixir Nanoweb string set acoustic coated 80/20 bronze EL-11077 Elixir Nanoweb string set acoustic coated 80/20 bronze EL-11002 Elixir Nanoweb string set acoustic coated 80/20 bronze EL-16052 Elixir Nanoweb string set acoustic coated phosphor bronze EL-16077 Elixir Nanoweb string set acoustic coated phosphor bronze EL-16102 Elixir Nanoweb string set acoustic coated phosphor bronze