LONGEVO SERIES - STAINLESS STEEL Like their nickel-plated counterparts, the Longevo Stainless Steel series are ecological and biocompatible and provide players with an extremely long life span of use. While respecting the environment as a green brand the use of applied nanotechnology totally ecological and biocompatible makes these superior strings resistant to corrosion with no impact on tone, tension, intonation and reliability! Mark Strings are made at our factory in Abruzzo (Italy), using the best selected innovative materials and ultimate quality controls matched with the ancient tradition of master string makers. Maybe not many people know that since the past centuries Abruzzo has been the motherland of almost all string makers. The art of string making was born in this beautiful part of the world and many great brands in today’s worldwide market can trace their own origins here, it's a history made of skilled hands, hard work, sacrifices and so much genius: typical features of people from Abruzzo. This artistry and know how have been exported worldwide as well, offering a superior product with exceptional performance, amazing feeling, intonation and reliability! After the worldwide success we got with Markbass Strings and the staggering number of request we received for guitar strings we are now ready to continue Abruzzo ancient master strings' history and tradition, giving to Guitarist the best strings they deserve.