(30) Empty 21 mm Thick Quad Blue Replacement Boxes / Cases for Blu-Ray DVD Movies - Holds 4 Discs  - BR4R21BL Replace your broken or scratched Quad Blu-Ray DVD Boxes & Keep Your Collection Looking Nice Perfect for storing your 4-Disc Blu-Ray sets in Full Clear Wrap Around Sleeve To Hold Artwork Embossed Blu-Ray Logo on Top of Case These cases are 6-3/4" x 5-1/4" and ~0.83" (21mm) thick