This CytoSoft product, Catalog Number 5145, has an elastic modulus of approximately 64 kPa in a standard flat-bottom 6-well plate. The thickness of the silicone gel is uniform with a ~0.5 mm thick layer of silicone in each well that is fully compatible with mammalian cell cultures. The plates are packaged individually, sterilized using irradiation and provided with 5 plates per package. The rigidity of the substrate to which cells adhere can have a profound effect on cell morphology and gene expression.The silicone substrates of CytoSoft products are optically clear and have a low auto-florescence. The layer of silicone in each well is firmly bonded to the bottom of the well. Unlike hydrogels (such as polyacrylamide gels), silicone gels are not susceptible to hydrolysis, do not dry nor swell, are resilient and resistant to tearing or cracking, and their elastic moduli (rigidities) remain nearly unchanged during extended storage periods.