Savarez Strings for classic guitar YAMANDU COSTA 7-string - 7-string high tension (Y510MJ7)Custom set for 7 string Brazilian and classical guitars The YAMANDU COSTA set consists of: Treble strings: New Crystal nylon strings for E1 and H B2, fluorocarbon string for G3 Bass strings: synthetic core wound with silver plated copper wire Special feature: 7th string, specially developed and manufactured for Yamandu Costa. The string can be tuned in the A, H B, and C range and retains its playing characteristics The bass strings are packaged in