Editorial Review This is the acoustic guitar strings that Japan's largest integrated manufacturer of musical instruments "YAMAHA" is manufacturing. Bosabitsuru the Anti-Rust Technology Yamaha new development has been subjected. Currently, it becomes this chord that is stretched YAMAHA Acoustic guitar factory. 3 winding string of six-string, it is very thin coating has become a pile specification to rust by the applying, tone and playability are features that are very natural. » rust specification only 3-6 string. 1,2-string has bundled the FS51, FS52. FS50BTE-1stB-2ndG-3rdD-4thA-5thE-6th.012.016.025.033.042.052