These polypropylene petri dishes are clear, unbreakable & autoclavable. Material : Polypropylene Model No. Perticulars Packing (PCS) ALPHA CHEM-836A 50mm 36 Pcs ALPHA CHEM-836B 75 mm 36 Pcs ALPHA CHEM-836C 100 mm 36 Pcs ALPHA CHEM-836D 125 mm 12 ALPHA CHEM-836E 150 mm