Each La Bella DL-L mountain dulcimer string set contains four loop end strings. La Bella provides a four-step, lab tested, tarnish proof technology on these sets that provides vibrant, aesthetically pleasing stings. The strings are Plain Steel (P) or Stainless Steel Wound (W) as follows: 1st- 0.012 P; 2nd-0.012 P; 3rd- 0.012 P; 4th- 0.021W