Microscope Slides, Glass, 25 x 75mm, 90? Ground Edges with Safety Corners, Green Frosted, 72/Box, 20 Boxes/Case (10 Gross) Globe's color frosted microscope slides are offered in five bright, attractive colors. They are available in three edge styles: ground, ground with safety corners or beveled. The ground edge microscope slide offers 90? corners and is perfect for use in automatic cover slip machines. The ground edge microscope slide with safety corners provide slightly clipped corners for comfortable handling and to prevent the risk of finger and hand cuts. The beveled edge microscope slide is ideal for performing blood smears. The highly polished edges are specially angled at 45? to provide a secure grasp during the smearing process. All microscope slides are printed with "Globe" under the frosting area for orientation purposes. They are pre-cleaned and ready to use.