SIT 12 string phosphor bronze light acoustic guitar strings. Thanks for your interest in the SIT 12 string phosphor bronze light gauge 10 - 46 at DC Music Store. Phosphor (92/8) bronze cover wrap over a Swedish steel hex core. Exclusive "Fusion Wound" technology utilizes electricity to adhere the bronze cover wrap more tightly to the core. This process eliminates loose spots in the winding (which can cause a dead sound) and increases string life. Good for all applications and ideal for use with pickup or capo.