RC Classical Guitar String BassPaks come with an extra 4th string.
RC Strings Classical Guitar Strings
RC Strings SN10B Sonata Classical Guitar Strings, BassPak
Set of 4 Sonata bass strings (2 D/4ths, 1 A/5th, 1 E/6th). A silverplated bass set with a strong fundamental and brilliant overtones. These strings settle into tune very quickly.
| Note | Gauge (in.) | Gauge (mm) | Material |
| E | 0.031 | 0.79 | silverplated wound |
| B | 0.034 | 0.86 | silverplated wound |
| G | 0.043 | 1.09 | silverplated wound |
