Cat. H-24-Collagen: 24 mm diameter, # 1 thickness, 45 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 3 = 45, sterilized, ready to use. Other suggestions: H-25-collagen, H-22-collagen. All these three collagen coated coverslips are 6 well plates compatible.