Opal 37/96 Accordion The Opal has the exact same size as the 72 bass Achat. The 37 trble keys are slightly smaller than regular sized keys which allows to accomodate them in the smaller housing. It has 3 banks of reeds for the treble side, however it comes with 7 switches for convenience. 96 basses with 4 reed banks and three switches. This instrument is a real nice alternative for somebody looking to cut down on weight and size, but not loosing any tone range. Available in the following colors: White Marble Celluloid Grey Marble Celluloid Green Marble Celluloid Blue Marble Celluloid Red Marble Celluloid Wood Imitation Special colors Pearl colors Wood Imitation