Each La Bella ST-30 set contains seven main strings and eleven sympathetic 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- 0.012 P; 2nd-0.016 PG ; 3rd- 0.022 PG; 4th- 0.028PG; 5th- 0.009P; 7th- 0.009P; 11 sympathetic- 0.008P