Each tray stores 20 standard 25 x 75 mm (1" x 3") slides in a horizontal position for full visibility. White polystyrene background makes it easy to distinguish dyes and stains. Trays can be used independently or conveniently stored in the Scienceware® Slide Tray Cabinet (M3585). Handy finger cut out simplifies removal of slides. 17 x 34cm (7½" x 13½"). 6 per box, 12 boxes per case.