Description Acoustic Phosphor Bronze Still the world`s favourite acoustic string that has been around for decades and will continue to do so. James How, who founded the company in the fifties, engineered a new type of string-winding machine that was a step ahead of the industry and all the strings are produced to the same degree of precision. In addition to the phosphor-bronze round wounds, Rotosound also make guitar strings in the piano string design. That is with the wrap wire stopping short of the ball end so that a section of the core wire is exposed and only the core wire comes into contact with the saddle. These strings are called ‘Country Gold’. It is actually an old idea and I have a feeling that the very first steel strings used on the guitar in the 1800′s were like that. The gauges for both types of string are 060 to 018 covered, and 026 to 008 plain. Please note: w denotes wound string GAUGES: ROTOSOUND JK10 (10-50) JUMBO KING PHOSPHOR BRONZE GUITAR STRINGS Gauges: 10 14 20w 28w 40w 50w ROTOSOUND JK11 (11-52) JUMBO KING PHOSPHOR BRONZE GUITAR STRINGS Gauges: 11 15 22w 30w 42w 52w ROTOSOUND JK12 (12-54) JUMBO KING PHOSPHOR BRONZE GUITAR STRINGS Gauges: 12 16 24w 32w 44w 54w