Typical dimensions are: length 45–50 cm; width (upper bout) 23–24 cm; width (lower bout) 29–30 cm; depth 11–12 cm.[6][7] Many models have a simple sound hole (8–9 cm), although some specimens show highly decorative rosettes. The bridge frequently has showy extensions called "daggers" that extend along the top. On each upper bout are two "auxiliary" tuning machines, for tuning the four outlying strings (two on each side of the neck).