Heathrow Scientific HD15991A Blue Polypropylene 100 Place Economy Microscope Slide Box, 210mm Length x 169mm Width x 37mm Height Polypropylene storage box for holding either 25 or 100 microscope slides securely Holds 25 x 75mm (1 x 3") microscope slides (sold separately) Numbered slide positions and content sheet for listing slides Top-hinged lid with clasp for slide security Blue, red, and white assorted colors