1.lab Cover Glass 2.no bublble,no scrape 3.OEM welcome 4.with CE and ISO 5.prompt delivery We are manufacture of lab and madecial glass bottles,glass tube,glass slides,glass covers and other containers.Microscope Cover Glass Economy GradeSize18x18mm 20x20mm22x22mm 24x24mm 22x32mmSize22x40mm 24x40mm 22x50mm 24x50mm 22x60mm 24x60mm lab Cover Glass