La Bella Vivace MT, String Set for Classical Guitar, Thickness: Medium tension, Treble strings made of fluorocarbon, Bass strings (winding): Silver-plated, Winding type: Round wound, Fluorocarbon treble strings offer the brightest sound of all classic La Bella strings, Silver-plated wound bass strings with particular stability in tuning and a balanced sound, Packaged in a modified atmosphere to prevent tarnishing and maintain freshness, Made in USA