MJ Franks Guitars - An engineer by trade, Mike constructs his instruments with the belief that fine, repeatable acoustics have everything to do with solid design, choice materials and exacting construction. That is not to say that appearances are not important. To say that Mike is anal regarding the fit and finish of his instruments is an understatement. His selection of materials is as painstaking as his building style. Old-Growth Brazilian Rosewood and Master Grade Adirondack Spruce are favorites as well as Mahogany, Spruce and Koa.