E1, H2 and G3 consist of a high -quality, nickel -plated steel wire and are also coated with real gold. D4, A5 and E6 - The core of these strings is a tinned hexagon steel, wrapped with gold -plated conversal wire. Developed and handmade in Germany the best materials and for the highest sound Designed claims. In this series reflects yourself die Optima 90-year tradition in string production opposite. Gold coated and therefore completely insensitive to the start Or corrosion, their durability is up to three times higher than with Normal strings and they are suitable for nickel allergy sufferers. Optima 24k Gold Strings are characterized by a brilliant Sound image and the typical Sound of Gold off, the under also other Frank Zappa loved. And of course plays too Brian May on his guitars Op.