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Sigma SDM-18 Dreadnought Acoustic in Natural

All Solid Construction. Softshell Case Included.

Written by

Chris Toft

The Sigma SDM-18 is a classy dreadnought size acoustic with an elegant simplicity and plenty of vintage charm. Featuring all solid wood construction, the SDM-18 uses the classic pairing of a Sitka Spruce top and Mahogany back and sides to deliver warm, vintage inspired tones. An Ebony fingerboard brings a pleasant snappiness to the SDM-18 and the low profile Mahogany neck feels sleek and comfortable whether you're playing chords or single note lines. The S000M-18 comes in a durable softshell case so you can be sure it'll be well protected when you're on the move.

Key Features

  • All Solid Woods - Produce a rich, warm tone that will improve the more you play the guitar over time.
  • Dreadnought Body Size - The quintessential acoustic guitar is perfect for strumming big chords with plenty of volume and projection.
  • Grover Open Gear Tuners - Maintain excellent tuning stability whilst bringing a vintage aesthetic to the SDM-18.
  • Low Profile Mahogany Neck - Sleek and comfortable up and down the fingerboard. Chords feel effortless and your hand won't feel fatigued when playing for long periods.
  • SSC-D Softshell Case - This lightweight, durable gigbag ensures the SDM-18 will be protected against the elements when you take it out of the house. 



  • Body Shape: Dreadnought
  • Top Material: Solid Sitka Spruce
  • Body Material: Solid Mahogany
  • Finish: High Gloss


  • Material: Mahogany
  • Profile: Low Profile
  • Scale Length: 25.4" (645 mm)
  • Fingerboard Material: Ebony
  • Number Of Frets: 20
  • Nut Material: Bone
  • Nut Width: 1 11/16" (42.9 mm)
  • Joint: Dovetail


  • Finish: Chrome
  • Tuner Plating: Chrome
  • Saddle: Bone
  • Tuning Machines: Chrome, Grover Open Geared
  • Pickguard: Tortoiseshell


  • Strings Gauge: D'Addario EXP16
  • Case: SSC-D Softshell Case
Inc. VAT


More stock due on Friday, 11 February 2022  

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