Extend the life of your favorite string set with Royal Classics custom Basspaks. * Royal Classics Flamenco Basses are bright, expressive, long lasting and tune up quickly. * The Flamenco high tension Basspak is gauged.78mm/.031", .86mm/.034", 1.09mm/.043" and includes an extra #4 string. * Treated with an ultra thin proprietary anti-oxidant coating. * Crafted in Spain by and for serious guitarists.