The main orchestral string instruments include the violin, viola, cello, and double bass. The violin, typically the highest in pitch, is often divided into first and second sections within the orchestra. The viola has a slightly deeper tone, while the cello provides rich, warm sounds in the lower register. The double bass, the largest string instrument, offers the lowest pitches and serves as the foundation of the string section's harmony.
string section
The Double Bass is a string instrument. Other instruments in the orchestral family of string instruments are the violin, viola and cello.
Bowed and plucked
Traditionally, we can find a violin, cello, viola, and bass used in an orchestral arrangement.
Vibraphones
The Double Bass is part of the String family of orchestral instruments. Other instruments in this family include: Violin Viola Cello And Harp to some extent, although Harps are not bowed string instruments.
The four orchestral familes are percussion, brass, strings and woodwinds. However, this is not the true order because persussion instruments do not always have a defined pitch, and they could be in any pitch range. The other three families, brass, string and woodwinds, can be placed in pitch order:Woodwinds (main and related)BrassStrings
In orchestral music, the main groups or families typically include strings, woodwinds, brass, and percussion. A group that does not fall into these categories could be electronic instruments or vocal ensembles, which are not traditionally considered part of the orchestral framework. Additionally, instruments like the guitar or piano, while sometimes included in contemporary orchestras, are not part of the main orchestral families.
If you mean other members of the String family (bowed) of orchestral instruments: Violin Viola Cello
Orchestral string instruments all use 4 strings.
Vibraphones
ViolinViolaCelloBassHarp