These hinged lid style boxes are offered in our .065 MicroChamber boxboard. MicroChamber boxes offer an advantage over other archival boards as only MicroChamber materials are able to trap and neutralize potentially harmful acids and other by-products of deterioration released by the Pocket CD/DVD itself over time. They have metal corners and attached flip back lids. Each box measures 10 or 12 inches x 4-1/4 x 4-1/4. The 10 inch box will accommodate up to 40 Pocket discs in jewel cases.