The instruments played in traditional folk instruments orchestras in Russia would typically include (domras mentioned are the three-stringed version):
Piccolo domra (limited)
Small domra 1
Small domra 2
Mezzo-soprano domra (limited)
Alto domra 1
Alto domra 2
Tenor domra (limited)
Bass domra 1
Bass domra 2
Piccolo balalaika (limited )
Prima balalaika
Sekunda balalaika
Alto balalaika
Bass balalaika
Kontrabass balalaika
Bayans, in several voices
Guslis
Flute
Oboe
Clarinet and Bassoon (optional)
Percussion, including tympani, snare drum, cymbals, triangle, xylophone, bass drum and (less commonly) hanging bells, marimba, vibraphone.

  In the United States, the four-stringed family of domra instruments finds more favor than in Russia.  This is largely due to the fact that there is no conservatory system here which teaches the three-stringed domra.  Musicians who play domra tend to be those with some background in mandolin or violin, who are familiar with the four-stringed system.  

  In Ukraine, the four-stringed domra family is standard and the role of the balalaikas is minimized.  National stringed instruments such as the bandura, kobza and tsimbali are included.