<P> Blank CD and DVD media are often sold in bulk packages called spindles or, less formally, cake boxes . This type of packaging consists of a round, clear plastic cup that mates bayonet - style to a base with a central post that holds a stack of discs; dummy discs made of clear polycarbonate with no recording surface are often packed on the ends of the stack to avoid scratches from contact with the hard plastic of the packages . Such packages have been designed to hold anywhere from ten up to 100 discs, and offer the user multiple options for packaging the finalized disc . </P> <P> TDK and Memorex have begun selling some of their blank media in what they refer to as "Snap n' Save" cases, essentially polyethylene cases designed to hold up to ten discs in a package . </P> <P> Finally, some bulk packages of blank media forgo a permanent container completely, instead using a simple blister pack for small numbers of media, or bundling large numbers of discs in shrink wrap to reduce waste . </P> <P> Retail stores have several strategies to deter shoplifting of CDs and DVDs . Some used CD and DVD stores keep the actual discs behind the counter, in plastic sleeves . The CD and DVD cases on the shelves for the customers are empty . Since the album cover art is still on the CD and the movie poster and information is still on the DVD case, the customers can still browse through the CDs and DVDs to make their selections . </P>

What is the size of a cd case