Archival Methods Metal Edge Short Top Box 4 x 6" Postcards 10.5 x 6.5 x 4.5", Tan The short top boxes have removable, close-fitted tops to seal out dust and insects. Embossed labeling areas on box end and lid front neatly, accurately and consistently locate and position standard pressure-sensitive (PSA) identification label. Short top boxes are manufactured from .040 and .060 tan-finished, acid- and lignin-free Archival Grade boxboard. Metal edge clamps are corrosion treated in black polyester coating with wax-free polyester on the blind side. Clamps provide rigidity and high stacking strength.