Petri dishes are widely used in biology, biochemistry and biomedical laboratories to cultivate various microorganisms such as bacteria, yeasts, and molds, and they also serve as essential vessels for adherent cell culture experiments. This labware is most suited for organisms that thrive on a solid or semisolid culture medium surface, enabling researchers to observe colony growth, conduct strain isolation, and perform cell proliferation analysis conveniently. Each complete set consists of a flat circular base and a loose-fitting matching lid with anti-slip stacking rings; the inner surface of the base is ultra-smooth and highly transparent, eliminating visual interference during microscopic observation so that stable, accurate and repeatable experimental results can be obtained every time.