They are manufactured in Polystyrene, Polypropylene & Polycarbonate. Polystyrene Plates are Optical Clear, Non-toxic & Disposable & are sterilised by either Gamma Radiation or ETO Sterilisation method. Polypropylene dishes are Unbreakable & can be Autoclaved repeatedly. Polycarbonate dishes are Clear, Transparent, Unbreakable & Autoclavable repeatedly. They are individually packed in a poly bag.We customise these plates as per your requirements.