Petri Dishes, offered by us, are molded in Polypropylene are clear & unbreakable. The molding material being Polypropylene, these can be repeatedly autoclaved. The ridges on the inner side of the cap prevent the base from sticking to the cap. For that, we are stated as the highly called for manufacturer of Petri Dish. Acknowledged For :- Molded in PolypropyleneClear & unbreakableCan be repeatedly autoclavedRidges on the inner sidePrevent the base from sticking to the cap Capacity