[Material] A petri dish is a shallow, transparent dish with a lid. These clear culture dishes are made of thick polystyrene, sturdy and durable, with a smooth and highly transparent surface, clearly visible, and meet reasonable quality standards to ensure accurate quantitative analysis. [EO Sterile] These lab petri dishes with lids are ethylene oxide sterilized, absolutely safe as they are made of polystyrene plastic and sterilized with ethylene oxide, meeting reasonable quality standards. Mycology supplies for liquid culture lids and agar plates mycology, a bacterial science kit. [Packaging] Product size and packaging of plastic petri dishes with lids are petri dishes with vented lids. (vented lid for better gas exchange and the dishes are stackable) [Uses] These sterile petri dishes with lids are suitable for laboratory analysis, school science projects, science-themed parties, biological and scientific projects for mycology research; general education and other activities are also applicable. Color: transparent Material: plastic Size: 60 x 15 mm Package contents: 30 x Plastic Petri Dishes Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The allowed measurement error is +/- 1-3 cm.