FRAR 2010: 18-Ni Cupronickel, 2.0mm, for 41" acoustic guitar, 20 frets, 42-56.4 FRAR 2210: 18-Ni Cupronickel, 2.2mm, for 41" acoustic guitar, 20 frets, 42-55.6 FRER 2710: Stainless Steel, 2.7mm, for electric guitar, 22 frets, 42.3-54.8
