Our highly secret core to cover ratios used in their making offers such brilliant sustain and tonal nuances few others can equal. The longer European eye adds extra strength at the ballend. All Rotosound music strings are manufactured in England. Guthrie knows a thing or twoandhellip;. The humble guitar string seldom evokes the same kind of excitement or obsession as instruments, amps or pedals. Nonetheless, your strings are a vital component of the sounds you make ; your entire rig would be distressingly quiet without them.