This corum alliance high-tension classical guitar nylon string set features savarez advanced corum basses. extremely comfortable and responsive to the touch, these strings produce a rich, focused tone. the multifilament (specifically treated nylon) wound basses are plated with corrosion-resistant silver for a smooth feel and warm tone with the necessary clarity. they are the only strings to offer exceptional flexibility as well as the proper stiffness, which delivers a quick and accurate response. they also offer an improved pliability compared to the traditional strings. the alliance trebles are made from an exclusive composite fiber that produces an remarkably clear, consistently rich sound at every position. the alliance trebles have incredible tensile strength, masterful elasticity and elongation, a consistent core for perfect intonation, and are extremely resistant to fraying.