Aquila Nylgut Concert Ukulele Strings are regarded by Ukulele players as some of the best available. Nylgut, distinguishable by its colour, is nearly the same as natural gut and has a specific density and acoustical qualities nearly identical to that of gut, but with a very high breaking point index of 310Hz per meter. Nylgut is the first and only synthetic string that possesses the sonic qualities of the natural gut string.

Other features of Nylgut are its elevated resistance to wear under tension and its resistance to changes of climate, which are greater than that of Nylon and thereby ensure a superior stability of tuning under normal conditions.