Pro-BB supports an open or resonator back banjo. It will also support certain resonator, jazz guitars, to include resonator-type instruments with bodies up to 3” thick at the bout. The classy highly stable design is fabricated from 13 alternating layers of high-strength birch. packs away in cases or gig bags. • Inert proprietary silicone T moulding at all exposed areas • 13 layers of laminated birch strength • Stainless hinge with non-slip pins • Two-position back brace • Measures 8 3/4″ x 4 1/2″ x 1 1/2″ when closed • Has a 13″ deep x 11″ wide footprint • Comes in a black velveteen bag