premium microscope slides: pathology-class, pre-cleaned slides with a choice of cut or ground edges. choose 90 or 45 corners. available in plain or frosted styles. choose single- or double-frosted. select frosted color. double cellophane wrapped. standard microscope slides: standard-class, precleaned slides with paper interleaves have ground edges with 90 corners. available in plain or single-frost styles. nylon tropical packaged. premium microscope cover glasses: square or rectangular cover glasses are packed in hinged boxes.