80/20 Bronze wound strings are often called old-school, vintage and/or bright bronze and were the most popular (only) alloy used to make acoustic strings until the introduction of phosphor in the early Seventie...
Curt Mangan 13-56 Medium Phosphor COATED Acoustic Guitar Strings
Nickel-plated steel wound strings were introduced in the late Sixties and have become the most popular alloy for electric guitars and bass. Nickel-plated steel tends to offer the most balanced tone, and are created by wrapping nickel-plated steel alloys around a core wire which is made from tin-plated high-carbon steel. It's a classic recipe that works superbly for all styles of music
