The Lyons Orff metallophones are designed with both quality and economy in mind. These instruments begin with a chambered wood box enhancing tone. Hand-lathed and hand-tuned aluminum tone bars combine a bright sound with steady overtones. Each bar has the note name engraved at the top for easy identification. All diatonic units include two F# and one Bb bar to allow your students to play in various keys. Bell mallets are included. The note range for the Bass Metallophone is C3 to A4 and includes Add-on bars F#3 Bb3 and F#4. This allows the key signatures of C F and G major to be performed. The note range for the Alto Metallophone is C4 to A5 and includes Add-on bars F#4 Bb4 and F#5. This allows the key signatures of C F and G major to be performed. The note range for the Soprano Metallophone is C5 to A6 and includes Add-on bars F#5 Bb5 and F#6. This allows the key signatures of C F and G major to be performed.