Features: 1.EASY TO OBSERVE: Laboratory petri plate dish allows you to observe changes in seed or cell cultures under a microscope, which helps to keep trace, and also allows you to mark different samples by writing or labeling on the petri dish. 2.HIGHLY TRANSPARENT: Petri dishes are made of plastic material, highly transparent, lightweight but sturdy and unbreakable. 3.FLAT BOTTOM: Cell culture dishes are uniform in thickness and have a flat, smoothly bottom, making them suitable for medicine, biological, scientific and other activities. 4.APPLICATIONS: Laboratory petri plate dish is suitable for general training, bacteriology laboratory, science laboratory, mycology research, bringing convenience to your life. 5.WITH LID: Clear petri dish with lid, convenient for closed culture, 20pcs pack, sufficient quantity to meet your DIY needs. specification:Item Type: Sterile Plastic Petri Dishes with Lid Material: Plastic Size: Approx. 9 x 9 x 1.5cm / 3.54 x 3.54 x 0.6in (0.1 to 0.2cm Error in Manual Measurement) Uses: Great for School Projects, Laboratory, Cell Culture, Plant Seeding and Other Science ProjectsLaboratory PackageList:20 x SterilePlasticPetriDisheswithLid