Offered for sale is a case of 500 of our standard, non-vented, disposable, Polystyrene Plastic Petri dishes. Measuring 90mm in diameter and 15mm deep, these useful dishes come packed in sleeves of 20 and have been sterilized by Gamma Radiation. Great for use with any of our Ready-to-Pour agar. Can also be used to organize and display crafts, beads, jewelry, sand or anything else you can imagine! *Case of 500 - contains 25 sleeves, each containing 20 sets (top and bottom) of Petri dishes.