High quality steel core and a unique damping process give these strings a warm, Manufactured with anti-corrosive technology Great playability, consistency, and extreme durability D’Addario has the highest quality standards in the world and manufactures strings with D’Addario Debut violin strings are raising the standard for low-cost strings. They offer a warmer sound than comparably-priced steel core strings, are balanced across the set, have great bow response, and are reliably durable. We use revolutionary new production techniques in our New York facilities, allowing us to create high quality steel core strings at an extremely affordable price. Players no longer have to settle for inferior, inconsistent strings simply because of budget constraints. Brand D' Addario SKU 101218274_NP-1021948648 Model D310 4/4M