Darco Acoustic Guitar Strings D2200 Lt Bronze 3 Packs Light String Gauges: .012, .016, .025w, .032w, .042w, .054w Tension: 164.8 Ball End 92/8 Phosphor Bronze: This alloy is comprised of 92% copper, 8% tin and traces of lead, iron, zinc and phosphor. These strings produce a bright but slightly warmer sound than the 80/20. The phosphor in the alloy helps them to retain their new sound for greater consistency.