Corning® cell culture dishes are manufactured from optically-clear virgin polystyrene. They are sterilized by gamma radiation and certified nonpyrogenic. They have stacking beads to aid in handling and are supplied with vents to provide consistent gas exchange. Cat.No. 83-430196 has a 2mm grid. Choose between standard Costar® TC-Treated dishes or the patented CellBIND® surface for enhanced cell attachment. The Ultra Low Attachment dishes feature a covalently bound hydrogel layer that effectively inhibits cellular attachment. This surface minimizes protein absorption, enzyme activation, and cellular activation and is non-cytotoxic, biologically inert, and nondegradable.