EJ45TT, normal 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., D'Addario's best-selling Pro Arté set, Normal tension offers balance of volume and comfortable resistance, Laser controlled clear nylon treble strings for consistent, precise intonation, Precision wound basses for warm, projecting tone and the utmost consistency, Environmentally friendly, corrosion resistant packaging for strings that are always fresh, All D'Addario strings are designed, engineered, and manufactured in the USA.