The J71 Normal Tension Ukulele Set consists of an all-nylon string is inspired and guided by the virtuosity of D'Addario ukulele artist, Jake Shimabukuro. This set made from an assortment of Pro Arte' classical guitar string gauges. All Pro Arte' strings are sorted by a sophisticated, computer-controlled, laser machine, which performs diameter/tension measurements and quality checks, ensuring that each set is well-matched, true-sounding and precisely intonated.