The La Bella BTM-40 Tambura string set contains 4 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 Plain Golden Alloy (PG) as follows: 1st- 0.022 P; 2nd- 0.018 P; 3rd- 0.018 P; 4th- 0.031 PG.