Made from clear and flat glass, with ground and polished edges. Dimensions variation of slides ±1 mm in length and width. Size 75 x 25 mm Thickness 1.1 - 1.2. Pack of 50 Plain Glass Slides Microscope Plain glass blank slide - Made from clear and flat glass, with ground and polished edges. Dimensions variation of slides ±1 mm in length and width. Size 75 x 25 mm Thickness 1.1 - 1.2. Pack of 50. Does not include cover slips