590mm square, 32mm thick MDF work-board precision machined on CNC with the specified radius. For gluing braces and sanding sides to fit top and back. The 10' is recommended for backs. It works well for creating tuned backs as outlined in the Contemporary Acoustic Guitar Design and Build
The work boards come unfinished.We recommend painting them with a few coats Polyurethane to keep glue from sticking to them and, if necessary stiffening them up by screwing them to a plywood backing.