One of the most used things in microbiology. Container for cultivation of microorganisms on agar nutrient media. Petri dishes are made of transparent polystyrene and have a flat cylindrical shape. They consist of two parts, one of which has a larger diameter and serves as a cover. Petri dishes have ventilation holes, which helps to create optimal conditions for the cultivation of aerobic microorganisms and cell cultures. Petri dishes have a perfectly smooth surface, are not prone to deformation, and are quite proof when dropped from a small height.