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Clearly superior, high-quality petri dishes are manufactured from virgin crystal grade polystyrene for optimum flatness and high optical clarity. VWR petri dishes are available in a variety of sizes and styles to accommodate both specialized and routine needs. The stacking ring feature, on some models, facilitates positive stacking while the slip-ring feature, on other models, facilitates lateral or automated handling. Dishes are sterilized by irradiation or EO and are packaged in linear tear, medical style bags.