These inexpensive and sturdy anaerobic jars can be used with all types of anaerobic generating reagents. The jar is made of polished stainless steel. Clear acrylic lid contains clip to view Methylene blue test strip indicator to measure anaerobiosis (see AnaeroGen™ products). Rack included with each jar. Small size is 7” high and holds 9 plates, large size jar measures 9” high and holds 12 plates.