.011 .014 .018 .030w .038 .050 - Set / E-Guitar 24 Carat Gold Plated Roundwound E1, H2 and G3 are made of a high-quality nickel-plated steel wire and are, additionally, coated with real gold. D4, A5 and E6 strings have a hexagonal tinned steel core and are wound with a gold-plated winding wire.OPTIMA GOLD STRINGS - Probably the finest string in the world. Developed and handmade in Germany from the finest materials and for highest tonal demands. This series reflects our 75-year tradition of string manufacture. The result is a string of unmatched premium quality. All strings are coated with real 24 carat gold and are therefore completely insensitive to tarnishing or corrosion. Their durability is, compared to normal strings, up to three times higher and they are suitable for people allergic to nickel.GOLD STRINGS are characterized by a brilliant sound and the typical SOUND OF GOLD, which also loved Frank Zappa. And of course, also Brian May plays on his guitars OPTIMA GOLD STRINGS