High quality glass 76 x 25 mm in size Double Concavity Pack of 10 Eisco Labs Microscope Slides, With Double Concavity, Pack of 10 These Microscope slides are manufactured from the best selected glass sheets, flat glass for microscope use with ground polished edges. Double concavity of 15 mm diameter each. Each slide has size 75 x 25mm, thickness of 1.3 ? 1.6 mm. Pack of 10.