Mouse 30-5 Walnut Fretted Bass #1088. This Mouse 30-5 is a lightly used bass in very good condition, featuring a 1pc. swamp ash body, eastern walnut top and faux tortoise shell binding. The 30” scale neck is from walnut, with a rosewood fingerboard and tiny mandolin sized frets. It is strung form E to high C, and comes with a deluxe form fit case, custom made just for this model.