Cat. GG-15-Collagen: 15 mm circular shape, # 1 thickness, 90 pieces of CE certified crystal clear German glass coverslips with rat tail type I collagen coating on both sides for cell culture and confocal fluorescence microscopy, sealed 15 pieces per bag x 6 = 90, sterilized, ready to use, 12 well plates compatible, Note: do not use 24 well plates to hold this 15mm coverslip because it is difficult to remove the coverslip from well after cell culture