Curt Mangan Fusion Matched strings 10 – 50 – 80/20 Bronze Extra LightGauges: 10/14/20/28/40/50 (Extra Light)Length of the string length 43 inches (109 cm) 80/20 Bronze strings are of old-school, vintage or bright bronze. To the early 1970s, 80/20 Bronze was the preferred material around to produce these strings for acoustic guitars. 80/20 Bronze is made from 80% copper and 20% zinc. They offer balanced treble and bass, with a slight emphasis the centre area to make the tone Durchsetzungsfähiger.