This Assembled 6-5/8" medium super is finger jointed and is Commercial grade. These boxes are assembled at our own local wood shop. The boxes are glued and stapled with electro-galvanized staples at each finger. Stapled joints naturally counter sink, which allows you to fill them to provide extra protection from rust, and achieve a very smooth finish. Like all pines, it is important to paint the box with an exterior latex or treat it with oil annually. Tung oil is a good choice.