The Suzuki Alto Single AS-37 Harmonicas have a one octave lower range than than the Soprano Single.  The Suzuki Alto Single harmonicas contain 37 holes with a range of C through C3 in the key of C. Solid brass reed plates hold the ultra precise phosphor bronze reed system, it is tuned by laser. Hardwood body and super smooth, solid brass, ergonomic reed covers create unparalleled playing comfort. The AS-37 comes in a leather covered, wooden case that is velvet lined.