sentences:  The 330 also features a body with Rickenbacker's "crescent moon" double-cutaway shape with sharp, unbound edges, and an "R"-shaped trapeze tailpiece.One idiosyncrasy of the guitar is its dual truss rods, which allow for the correction of problematic and unwanted twists, as well as curvature, of the guitar's neck.The 330 is equipped with a monaural jack plate, lacking the Rick-O-Sound stereo functionality of other Rickenbacker models such as the Rickenbacker 360.