Sterile Petri Dishes: 20 Pack of 90mm diameter x 15mm deep Sterile Petri Dishes with Lids Special Material: Ethylene oxide sterilization, unvented, with lids, easy to use. Multifunction: Laboratory analysis for medical, biological, scientific research, and other activities, suitable for general training. Package: 20 Pcs 90mm x 15mm Petri dishes,20Pcs Transfer Pipettes (10Pcs 3ml,10Pcs 2ml). Great for laboratory analysis, school science projects, scientific research, seed cultivation, mycology studies, etc.