Falcon™ Primaria™ Cell Culture Dishes with Easy-Grip™ design are made of surface-modified polystyrene for enhanced cell culture. Falcon™ Primaria™ cultureware features a unique nitrogen containing tissue-culture surface chemistry that improves attachment, spreading, and growth for many primary cells or cell lines. No special storage required. Sterilized by gamma irradiation, nonpyrogenic. Supplied with lids.