Cat. GG-25-Laminin: 25mm diameter, #1 thickness, 60 pieces of CE certified crystal clear German glass coverslips with mouse Laminin coating over PDL layer on both sides of coverslips for cell culture, sealed 15 pieces per bag x 4 = 60, sterilized, ready to use. You might consider #1.5 thickness, ie, GG-25-1.5-laminin, if you are going to take high quality images after culture using confocal microscope. GG-25-1.5-laminin is the most popular item in research labs.