EJ45TT normal tension is D'Addario's best selling Dynacore set, preferred for its balance of rich, projecting tone and comfortable feel. 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.