Elixir 11102 80/20 Bronze Nanoweb Coating Acoustic Guitar Strings, Medium, 13-56 Best value for Elixir guitar strings: multi-pack bundle savings on a range of string types and sizes 80/20 Bronze Nanoweb Coating Medium, 13-56 Model Number 11102 Only coated string brand to protect the entire string with an ultra-thin coating, keeping gunk out of the gaps between the windings