Play songs in the keys of G, C, or F with the Hohner 3100GB Panther 31 Key Diatonic Accordion. Use the 31 treble keys to play the melody and the 12 bass and chord keys to create the rhythm. Change the instrument's tone using the two sets of treble reeds. This black lacquer accordion with double-strap brackets is easily portable weighing in at 9 pounds and measuring 12-inches high by 7.5-inches deep.