D'Addario EJ46FF Pro-Arté Carbon, Dynacore Basses, Hard Tension Strings for Classical GuitarDàdario XTC46FF, XT Classical Dynacore Carbon, Hard Tension Strings for Classical Guitar.
XTC45FF combines Dàdario infamous Pro-Arte Carbon treble strings and silver plated wound Dynacore basses with an extended lifespan treatment, preserving the natural tone and feel of uncoated strings. Available in normal and hard tensions.Features

• Each individual wound XT Classical string has been specially treated with an advanced anti-corrosion process while maintaining the natural tone and feel of uncoated classical strings.
• Treated with our Dynacore winding technology's exclusive coating process, XT Dynacore bass strings deliver flexible feel with great projection and response.
• The carbon treble strings offer superior intonation with quick response, a modern, far-reaching tone and maximum sustain.
• The inner pack features an easy open and resealable zip closure for convenient storage of unused strings.
• Each set has its own Players Circle code for product identification, registration and authentication. The musicians can collect points and are rewarded with D'Addario products and merchandise
• String Gauges: Treble .0248, .0280, .0339 Bass .029, .036, .046