These are Quad CLEAR overlap DVD boxes with a hinged tray. These boxes hold 4 DVD's in the space of one standard (14mm) DVD case! These cases have a full clear wrap-around sleeve (this is where you slide the front paper / artwork into so it shows). They are the same size as a standard DVD box, but have overlapped trays on both sides of the case to hold four DVDs instead of just one! This is the perfect space saving design!