La Bella Has Over 400 Years of String Making Experience The tradition of string making dates back to the 1640s in Salle, Italy, where the Mari family supplied gut strings to the famous violin builders of Cremona. In 1913, brothers Olinto & Emilio Mari arrived in New York bringing their family craft to the States. Over the years, the brothers shaped the landscape of the string industry with their innovative designs. Every set is manufactured using a perfect combination of traditional methods and latest technologies to produce a superior string. 10BT 10-string Baroque And Romantic Tuning The 10BT (also known as 10RT) 10-String Baroque and Romantic Tuning Set has clear high-density nylon trebles and silver-plated wound basses for the first six strings. The extra low strings are specially designed for modern concert guitars with additional basses. Clear nylon trebles produced greater aural transparency and sound projection Silver-Plated wound basses produce exceptional memory for pitch and consistent sound production String Gauges: Clear Nylon Trebles: .029 .0335 .041; Silver-Plated Wound Basses: .029 .036 .042, .050, .052, .054, .056 Made in the USA with American Wire Packaged using MAP Technology (Modified Atmosphere Packaging) to prevent tarnishing and ensure freshness