[Package]Product size and packaging of plastic petri dishes with lid are Petri dishes with vented lid. (vented lid for better gas exchange and dishes are stackable) [Material] A Petri dish or Petri plate is a shallow transparent lidded dish. These clear culture dishes made of thick grade polystyrene, sturdy and , with smooth and highly transparent , clearly visible, meet reasonable quality standards to quantitative analysis accurate testing. [ Sterile]These lab petri dishes with lids are ethylene oxide , absolutely safe as these are made of polystyrene plastic and by ethylene oxide, meet reasonable quality standards. Mycology supplies for liquid culture lids and agar plates mycology, a science kit. [Applications]These sterile petri dishes with lids are suitable for laboratory analysis, school science projects, science theme parties, , biological, and science projects for mycology research; general training and other activities are also applicable.