These archival quality, crystal clear sleeves are specially sized to slide over a 12mm Blu-ray box to protect it from scuffing and scratching. These are a great way to keep your collection safe and pristine! Made from Biaxially Oriented Polypropylene (BOPP) means excellent sleeve clarity compared to the traditional Cast Polypropylene or Polyethylene, and provides archival quality safeness for your collection. They fit the disc and the case to protect it from scuff and wear. A built-in strip makes these sleeves ideal for storing your discs! These sleeves can be opened to show customers or for your own personal collection, and then be resealed almost forever! Please note that these are for the smaller 12mm thick Blu-ray/HD DVD cases - they will not hold a standard 14mm DVD case. They WILL hold a Playstation 3 and 4 game case! They also work great with the hardcover book-style XRCD packaging! Just slide them in from the side (with the flap on the left or right edge and folded back rather than the flap on top).