The standard OM at Heinonen Guitars is based on a traditional OM body shape, dimensions, and bracing pattern. Listed are the standard model specifications (see Pricing for more options):

• Radiused Spruce top (Variable species)
• Red Spruce bracing
• Scale length: 25.5"
• 14 frets to the body
  
• Nut width: 1.75"
  
• Saddle spacing: 2 5/16"
  
• Ebony fretboard
• Ebony headstock faceplate
• Ebony bridge
• Waverly tuners
• Unbleached bone nut
• Unbleached bone saddle
• Upper bout dimension:11 1/4"
• Waist dimension: 9 1/8"
• Lower bout dimension:15"
• Body depth at neck: 3 7/16" (can modify up to 3 3/4")
• Body depth at tail: 4 1/4" (can modify up to 4 1/2")
• Body length: 19 5/16"