Mouse 30 Walnut Fretted. This fine Mouse 30 features a very lightweight semi-hollow swamp ash body, with an eastern black walnut top (with f-hole option) and faux tortoiseshell binding. The 30” scale neck is also from black walnut with an aged Indian Rosewood fingerboard (50 years+), and matching bridge. A deluxe locally made form fit hardshell case rounds out the package.