J31's are Hard tension D'Addario Classics with silverplated copper wound on nylon basses. D'Addario Classics use rectified nylon trebles. Each treble stringis ground using proprietary centerless grinding techniques. Roundness and dimension control are unsurpassed, ensuring absolutely perfect intonation. Rectified nylon strings are known for their warmer tone and lightly textured feel.
Trebles: Rectified nylon, hard tension
Basses: Silver-plated copper wound, hard tension