EJ44TT extra-hard tension classical strings are optimal for maximum string resistance and projection without compromising tone. D'Addario Premium 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…rich, round and full with dramatically improved string life, tuning stability and consistency. This set is complimented by our titanium trebles (bright and projecting) for optimal tonal balance.