UKELELE STRING SET D'Addario EJ87T Titanium Ukulele Tenor String Set for Ukulele. Optimized for standard GCEA tuned Tenor Ukuleles. Caliber: Titanium 029, .033, .041, .029. D'Addario Titanium Ukulele strings are made from a dense monofilament material that has an attractive translucent purple hue and a smooth, polished feel similar to nylon. This unique material is particularly beneficial to the ukulele, due to its slightly brighter and more projected tone, resulting in more volume, clarity and dynamics.