The accessible Hohner HA-3100 Panther GCF Diatonic Accordion shares many of the quality features of Hohner's step-up diatonics with a lower price tag. New double-strap brackets. 31 treble keys. 12 bass/chord buttons. 2 sets of treble reeds. Plays in G, C, and F. The Hohner HA-3100 Accordion is 12"H x 7-1/2"D and weighs 9 lbs.New double-strap brackets31 treble keys12 bass/chord buttons2 sets of treble reedsPlays in G, C, and F12"H x 7.5"D9 lbs.