Nutrient Agar Plates, Deep Fill, a Standard Culture Medium for Growing a Wide Variety of Microorganisms Used in Water, Wastewater, Food, and Dairy Tests, 10 per Pack, by Hardy Diagnostics Great for science fair and classroom projects to learn about microbiology Polystyrene Petri plates feature raised rings for stacking ability and prevents sliding Packaged in sleeves of 10 plates in a breathable bag that prevents build up of condensation and excess moisture Optically clear polystyrene for distortion free viewing Heavy duty reduces breakage during shipping