Standard 10mm Thick! (Appx .43") This is the same size that the majority of CDs are sold in! Crystal Clear Jewel Box & Tray Allows Easy Viewing of Inside Papers. These jewel boxes are 5-9/16" x 4-7/8" and ~0.43" (10.4mm) thick. Cases Come Pre-Assembled. This listing is for 10 individual replacement boxes & trays. Replace those old, damaged & scratched cases with these crystal clear jewel boxes & trays! Broken trays can lead to the disc sliding around in the box which causes damage, so by replacing your trays and jewel boxes you not only protect your collection but it will look so much better in new jewel boxes!