Check the listing for details. EJ44TT ProArte Dynacore Classical Guitar Strings, Titanium Trebles Extra-Hard. Condition: New. Listed at 17.95 USD. EJ44TT Nylon Classical Guitar Strings Extra-Hard Tension EJ44TT, extra-hard tension, features Pro-Arté DynaCore basses and titanium trebles for the perfect blend of tone, brightness, and projection. D'Addario Pro-Arté DynaCore sets are constructed using our exclusive multifilament stranded core material with a revolutionary winding technique. The result is a truly unique and contemporary tone that is rich, round and full with dramatically improved string life, tuning stability and consistency. The included D'Addario Titanium trebles compliment the set with their bright and projecting tone for optimal balance across the set. Additionally, like all Pro-Arté trebles, each string is laser sorted for unsurpassed intonation consistency.