The 9stein combination bass and guitar is pretty rare: designed in the mid 1990s by Michael Reizenstein of Yonkers, New York and made by luthier Tommy Doyle. It has nine strings, tuned in consecutive fourths to allow easy playing in any key.The ergonomic body shape has an adjustable arm rest and lap support. It also has a built-in Boss BU-12 chromatic tuner, to help keep those 9 strings in tune.

The 9stein has a hand wound single humbucker pickup at the neck and fixed tune-o-matic style bridge