Here's what Sigma says about this model : The 000 size Sigma 000M-1 is a compact bodied acoustic guitar featuring a solid Sitka Spruce top. The body and neck are made from Mahogany which gives the 000M1 a well balanced acoustic voice. The neck is relatively slim and very comfortable with a 42.9mm nut width. The nut and saddle are made from bone which give the ultimate transfer of tone from the strings to the guitar. The body is finished with a gloss lacquer and the neck is kept satin. If you are on the market for a slightly smaller body acoustic guitar then the Sigma 000M1 is well worth checking out.