Custom signature 4 string set for mandolin that was developed in cooperation with Sam Bush, an American bluegrass mandolin player that is considered an originator of the Newgrass style. Strings deliver superior tone and long-lasting performance, and feature Monel winding over a hexagonal core of premium Swedish steel, for a pure, natural acoustic tone. Stings utilize strict quality control methods to ensure tone, durability and consistency. All Gibson strings feature specs absolutely unique to Gibson and are factory sealed to guarantee freshness in every set. Gauges: .011, .014, .025, .041.