This case is designed for 11" rim diameter resonator banjos with standard necks. It will fit a variety of resonator 5-string banjos (plenty of scope for wide pegheads) as well as resonator plectrum & guitar banjos. The internal sizes are: 42" x 14" x 4 ¼" This is a nicely-made hardshell case with thick plush lining. It has 4 catches, 2 hinges and a nice quality padded handle as well as an internal string compartment. A nice solid case which will give good protection to an instrument.