These 1.8ml polypropylene cryo vials are engineered for secure cryogenic storage and long-term sample preservation at ultra-low temperatures. The durable polypropylene construction maintains structural integrity through repeated freeze-thaw cycles without brittleness or degradation. Each vial features a secure screw cap that prevents evaporation and contamination during extended storage in liquid nitrogen or mechanical freezers. Graduated volume markings facilitate accurate sample quantification. The 1000-count bulk package provides economical inventory for biobanks, research facilities, and clinical laboratories managing large sample collections. Ideal for preserving biological specimens, cell cultures, and diagnostic materials.