The ADVANCED series bass strings are made of high quality selected alloy steel wire wound on hexagonal high carbon content core by the skilled hands of Markbass master string makers. They are designed to give softer touch and feeling while still offering a super string-to-string balanced tone and traditional stainless deep full and precise sound. Markbass Strings are made in Abruzzo Italy using the best selected innovative materials and ultimate quality controls matched with the ancient tradition of master string makers. Historically 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. This artistry and know-how have been exported worldwide as well offering a superior product with exceptional performance amazing feeling intonation and reliability!