[Material] A Petri dish or Petri plate is a shallow transparent lidded dish. These clear culture dishes made of thick grade polystyrene, sturdy and durable, with smooth and highly transparent surface, clearly visible, meet reasonable quality standards to ensure quantitative analysis accurate testing. [EO Sterile]These lab petri dishes with lids are ethylene oxide sterilization, absolutely safe as these are made of polystyrene plastic and sterilized by ethylene oxide, meet reasonable quality standards. Mycology supplies for liquid culture lids and agar plates mycology, a bacteria science kit. [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) [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. Colour:transparent Material:plastic Size:60 x 15mm 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 measurement allowed error is +/- 1-3cm.