• Manufactured in a Class 100,000 clean room. Growth surfaces are flat and free from striation to maximize usable growth area and transparency. • Serrated ring extends slightly beyond the lid and significantly improves handling by the base, preventing accidental drops. • Molded spacers between the lid and base allow for consistent gas exchange and stacking rings add stability when handling tall stacks of dishes. • Simplifies separation of the lid from the base. • Numerical clock locators (3, 6, 9, 12) molded into the base easily divide the dish into quadrants. • Supplied sterile (gamma irradiated) and includes lids. Sterility Assurance Level = 0.000001.