... by high clear,glass sheet,no bubble,no scrape,clear. Microscope slideProduced by high clear glass sheet, no bubble, no scrape ... , ground edges.4) 7104: Double concave, ground edges.5) 7105: Frosted one end on one side, un-ground edges.6) 7106 ... both sides, ground edges.8) 7108: Frosted both ends on both sides, ground edges.9) 7110: Frosted on one side, ground edges.