Mandolin strings designed in collaboration with musician Ronnie McCoury, whose hard, percussive style of play requires increased durability and tension of the strings to achieve maximum volume. The strings are made of bronze enriched with phosphorus, which guarantees a long carrying capacity of tones and a warm, clear sound. They have a stainless steel core and a cylindrical winding. Their "loopend" construction guarantees maximum versatility of use and special ecological packaging prevents corrosion. String thickness: .0115, .016, .026, .041, designation: Medium / Heavy.