Royal Classics BF30T Black Flamenco Nylon Guitar String Treblepak, Medium-High Tension Royal Classics specialty treblepaks are perfect for matching with your favorite bass strings Royal Classics Black Flamenco trebles offer brilliant response and traditional flamenco punch. The BF30T Black Flamenco treblepak includes 3 traditional black treble strings gauged .77 mm/.028", .85 mm/.033", 1.05 mm/.041" Royal Classics Black Flamenco trebles are formulated for a bright, expressive authentic flamenco response. Crafted in Spain by and for serious guitarists.