Petri dishes, polystyrene, disposable. 90mm 2 compartments, Triple Vent. Produced under sterile aseptic conditions. The 90mm dishes comply with BS611 Part 2 and are CE marked in compliance with the new in-vitro diagnostic directive (98/79/EC). Wine rack packaging of the 90mm and 140mm petri dishes reduces the risk of transit damage and facilitates handling.