The Longevo Series Nanofilm Shielded Nickel-Plated Steel Strings (10-46) combine artistry with Markbass innovation to create strings that feel as good as they sound. These electric guitar strings are shielded with an imperceptible microfilm, making them usable even by those allergic to nickel. This protective film also gives the strings exceptional longevity while still retaining amazing tone with unchanged elastic properties, intonation and reliability.