These Leitz Germany 2-Sided Slide Storage Chests hold a total of 100 slide mounts. These are DIN, otherwise known as Universal trays and fit most european slide projectors that have linear trays, notably Leica/Leitz projectors. The storage chest is comprised of a 2-compartment drawer that houses a total of 50 slide mounts on each of its sides. The price listed is for a single box containing 2, 50-slide trays. Some are new, others have been used for storage but all are in perfect condition.