The Borsini 96 Bass Accordion / Vienna K9 SC has 37 Treble Keys from F-1 to F-4 (16 5/8"). 4/5 Handmade Reeds with LMMH or LMMM, Double Tone Chamber, 11 Treble and 3 Bass Registers. Weight: 21.2 lbs. Colors: Black, or Black with tinsel highlights. Five-year warranty from date of purchase.