Corning Pyrex Borosilicate Glass Petri Dish with Cover, 145mm Diameter x 17mm Height (Pack of 12) Petri dish style: 150 x 15mm; bottom diameter x height: 145 x 17mm Made from borosilicate glass code 7740 Beaded rim provides greater mechanical strength and reduces capillary action of condensed moisture Reusable dish will withstand repeated sterilization (wet or dry) No surface treatment; not airtight