sentences:  Gibson models were mostly a scaled-up version of the traditional "A" style mandolin (teardrop shaped), with the exception of their limited-edition "O. Pagani" model, which more closely resembled an orchestral double bass in shape.The Pagani model was also one of the few eight-string mando-basses made in the US, with four double-strung courses like the European tremolo bass.Vega produced both a flat-back and a humped-back mando-bass (known as a "cylinder back"), both with a generally mandolin-shape in outline, but with markedly pointed upper bouts.