These â€œJuniorâ€ Bulk Slide Storage units contain six inner trays within a larger outer box and store up to 1080 35mm slides in easily identifiable groups, in either .065 MicroChamber/Silversafe board or .065 MicroChamber conservation board. Each inner box will hold up to 180 slides. The boxes come with neutral pH, non-buffered alpha cellulose index tabs to separate slides into eighteen groups. Note: the tabs are taller than the boxes, and are meant to be folded down when lids are placed on the box but will pop up to identify the groups of slides they separate. They also feature our corrugated insert follower block system, which uses slots to prevent slides from shifting in partially filled boxes. Full depth lids add extra protection, strength, and security. Measurements: Outside dimensions of outer cartons: 16-5/8 x 12-5/8 x 2-3/4 (come with 6 inner trays); Individual inner trays measure 11-1/2 x 2-5/8 x 2-1/2 inside. Inner trays are also available individually.