Disposable Petri Dishes are easy to use and is efficient for microbial culture.Dishes of 90mm diameter is for normal use , in addition to 35, 60, 100, 150mm culture dishes. High clarity polystyrene Petri dishes available in traditional 1 compartment styles as well as 2 compartment, 3 compartment, and 4 compartment options. Alkali Scientic Petri Dishes are designed to be used for bacterial cell culture applications in all types of labs. High clarity polystyrene Flat transparent surface Numeric mark on the bottom for easy identification PA/PE packaging Vent for gas exchange Stackable for easy storage and handling Non-pyrogenic Sterilized by E-Beam, SAL=10-6 Packing: 20/pk, 500/cs