Cat. H-25-1.5-Collagen: 25 mm diameter, # 1.5 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. H-25-1.5-collagenis is the same coverslips as GG-25-1.5-collagen with only difference in their quantity, 45 pieces or 90 pieces.