Heathrow Scientific HD15981A Polyethylene Microscope Slide Holder, 40 Slide, 298mm Length x 105mm Width x 24mm Height Slide holder with inclined channels for cleaning and drying microscope slides Holds 1 x 3" and 2 x 3" microscope slides (sold separately) Polyethylene construction for durability and chemical resistance Assorted sizes hold up to 15, 40, or 78 slides