Introduction and features 1.Material: PS (Polystyrene) 2.Brand: WHB 3.Gamma ray sterilization 4.Dnase/Rnase and pyrogen free 5. Available with 5 different diameters of 40, 60, 100, 110 and 150 mm 6. Clock at the bottom of dish, easy to record.  7.Thickness uniformity, flat and smooth bottom of dish, more accurate date analysis 8. Special structural improvement patents are obtained to increase the strength of the lid and bottom, Increase the adsorption of the inner wall of the petri dish 9. TC surface treatment, cellular adherent fine 10. Toothed ring design in dish side, easy to take hold, reduce pollution 11. The inside of dish cover have bump to exchange gas 12. Stacked rings make stacking and handling easier