Round core strings were once the standard for acoustic guitar strings. Today round core wound Phosphor Bronze strings have become a rarity with just a few companies, including ThroBak, now offering them. Wound with 92/8 Phosphor Bronze the round core gives a distinctive warm, full sound that any fan of round wound strings will immediately recognize. The added low end sweetness the round core adds makes these a popular choice for strummers and pickers. Available with Tinned or Bronzed high E and B strings. Made in U.S.A. using only the finest U.S.A. wire.