Archival Methods Metal Edged Hinged Lid Box 4 x 6" Envelopes/CD Cases 12.25x7.5 x 5-3/8", Black Hinged lid boxes have undercut front panels so contents can be easily filed, sorted or sifted. Embossed labeling areas on box end and lid front neatly, accurately and consistently positions a standard pressure-sensitive (PSA) identification label. Made of heavyweight Archival Grade boxboard. Metal edge clamps are corrosion treated in black polyester coating with a wax-free polyester finish on the blind side. Clamps provide rigidity and high stacking strength.