This Millipore® PetriSlide™ Dish for microbiological analysis is a perfect substitute for a Petri dish. The molded polystyrene dish with a pure cellulose pad holds the filter securely in place, while the transparent cover allows microscopic examination without removal. Rectangular 51 x 76mm base has rounded corners for mounting on a microscope stage. Sterilized storage and examination container is used for culturing microorganisms on 47mm membranes. Absorbent cellulose pad included. Sterile. Dish Material: Polystyrene. Pad Material: Cellulose. Size: 51 x 76mm. Shape: Rectangular With Rounded Corners. Filter Membrane Size: 47mm. Millipore® #: PD1504700.