Until the mid‎-20th century all treble guitar strings were made in gut‎,‎ a material that had been used for thousand of years and that combines good promptness of attack and excellent performances‎.‎ A fundamental aim of Aquila‎'‎s research has therefore been to design a new synthetic product having the same acoustic properties as gut‎,‎ but without its typical defects ‎(‎high cost‎,‎ short lifetime‎,‎ high instability under moisture changes‎)‎‎.‎ Their New Nylgut has precisely all these good qualities without all these defects‎.‎ Its features include promptness of attack‎,‎ excellent performances and a truly remarkable stability of intonation under moisture changes‎.‎ The Alabastro basses‎,‎ wound with high quality‎- silver‎-plated copper‎,‎ consist of a New Nylgut multifilament core that ensures not only a high resistance to tensile stress but also a low absorption of both atmospheric humidity and sweat‎.‎