This pack of six polypropylene petri dishes with lids is ready to use straight from the package. Each dish measures 2 inches (50 mm) in diameter and 0.5 inches (13 mm) deep, with lids measuring 2.1 inches (54 mm) in diameter. The translucent polypropylene construction is unbreakable, non-toxic, and non-sterile. These dishes are reusable and top-rack dishwasher safe for easy cleaning. They are suitable for general laboratory tasks such as cell culturing, plant germination, precipitate drying, solvent evaporation, and classroom science experiments. The chemical-resistant polypropylene material offers high heat tolerance and good durability for repeated use.