D’Addario Octave Mandolin EJ80 Phosphor Bronze Wound Strings November 7, 2012 by The String & Horn Shop » Products » Rentals » Orchestra Rentals » D’Addario Octave Mandolin EJ80 Phosphor Bronze Wound Strings Gauges 12-22-32-46. Designed for use with octave mandolins of various scales, the J80's unwound strings are made of plain steel and the wound strings are made of phosphor bronze for great, long-lasting tone. total_sales: 0 Quantity Price: $14.70 Updating cart...