Willer Custom Instruments A Legacy of Craftsmanship Auditorium Flamed Koa Back and Sides, Bearclaw Sitka Spruce Top, Ebony Binding, Thin Maple Side Purfling and Abalone Rosette. Ebony Fingerboard is bound with Ebony with Fine Maple Purfling. Ebony Headstock is bound with Ebony. Purfling is Maple, Black Fiber and Abalam. Ebony buttoned Waverly Tuners add a vintage look.