Aquila Soprano Ukulele Strings Aquila Nylgut Soprano Ukulele Strings Combining elements of traditional string making with modern manufacturing techniques, Aquila leads the ukulele string market in technological advancement. Until the mid-20th century, ukuleles were strung exclusively in gut, a material that combines excellent promptness of attack with brilliance of timbre. A fundamental aim of Aquila's research has been to make a new synthetic product having the same acoustic properties as gut, but without its typical defects (high cost, limited durability and high instability in varying climate). Nylgut