Quality material: these clear petri dishes are made of quality plastic, which have smooth surface and greatly transparent body, fitting for most experiment, giving you good use feelingAppropriate size: the outside diameter with the lid included is 90mm/ 3.54 inch, the depth height is 15mm/ 0.59 inch, plastic thickness is 0.6 mm and the lid diameter is a little bigger than the plate for a good air flowingEnough quantity: you will get 20 pieces plastic petri dishes with lid, enough quantity to meet your various need and replacement; In addition, you can share them with your partners or classmatesWide application: you can use these project petri dishes to help kids with their science experiment, relative themed parties, art projects and so on; You can also use these plastic petri dishes as gift boxes to hold nice presentsThoughtful design: these school petri dishes are optically clear for good clarity in microscopic examination; The petri dishes have a flat growth surface for uniform cell growth without clumping and vents in the lid provide cons 20 Pieces 90 x 15mm Plastic Petri Dishes with Lid Clear Projects Petri Dish for Laboratories Storing School Themed Party (WANAN)