Keller 100% Northern Hard Rock Maple Drum Shell. In a 6ply configuration. This unfinished shell will be custom cut at 3 inches deep, with a head size diameter of 13 inches. Beautiful raw maple outer ply is suitable for staining, finishing or covering with our drum wrap material. We take the extra steps of basic sanding and filling/plugging any core butt joints for you to speed along your building process - all at no extra charge!