With two guitar perfectionists like Steve Earle and Matt Umanov in charge, the M-21 Steve Earle Custom Edition guitar naturally starts with superb solid tonewoods. The top is Italian alpine spruce, revered for its clear, rich tone, and the forward-shifted scalloped top bracing enhances balance and responsiveness. The back and sides are East Indian rosewood for warmth and power. The low profile neck is carved from genuine mahogany. The acoustic guitar's headplate, fingerboard, and bridge are all East Indian rosewood. The polished and beveled Delmar nitrate pickguard and aging toner on the top complete the instrument's vintage style. The body showcases Martin's flawless polished gloss lacquer finish and the neck receives a satin finish for player comfort. It is also delivered in a blue molded hardshell case and each Martin M-21 Steve Earle guitar features an interior label personally signed by Steve Earle and Matt Umanov, numbered in sequence without a total.