Safety materialThese clear petri dishes are made of high quality plastic,ethylene oxide sterilization,Uniform thickness,transparent appearance is more conducive to observation. Strengthen protectionA specially designed petri dish cover facilitates optimal gas exchange.The lid of the dish is designed to be easy to cover and reduce pollution. Environmental protectionPetri dishes are better than reusable glass Petri dishes,which effectively reduce secondary contamination and ensure optimal experimental results,can be used in the simulated laboratory. ApplicationPlastic petri dishs laboratory dishes are widely used in schools,scientific laboratories,inoculation,and separation of bacteria. Package ContentsThree different sizes of Petri Plates:70mm 55mm 30mm.There are 10 petri dishes in each size.5 pieces of 3ml disposable graduated transfer pipettes.