Our sterile petri dish are ideal for all types of culturing where accurate bacterial count or microscopic examination is required. Breathing lugs on inside cover allow free circulation of air and prevent condensation. Some of our sterile petri dishes are manufactured for filling on automatic media machines without jamming. Our petri dishes are optically clear, made from virgin polystyrene and have consistently flat bottoms. Sterility is guaranteed on all lots. These are premium quality agar petri dishes that are demanded by discriminating users and our prices are extremely competitive with brands of much lesser quality.