This case is designed for open-back or flat-plate resonator uke banjos, tenor (& some baritone) size - but will fit a variety of other small banjos as well including some travel 5-strings. The internal sizes are: 28 ¼" x 9 ½" x 3 ½" This is a nicely-made small hardshell case with thick plush lining (that can be modified to accommodate instrument which have slightly larger rims). It has 3 catches, 2 hinges and a nice quality padded handle as well as a small internal string compartment. A nice solid little case which will give good protection to an instrument.