By preventing the drying out of the tip, any contamination becomes subsequently easier to remove, making the cleaning and sterilisation processes more effective. The vials are available as close lid (allowing the vials to be pre-charged with sterile solution) or open lid (allowing vials to be filled once the distal tip has been inserted). The vials are fashioned from polypropylene, with silicone lids and a Plexiglas® tube holder (sold separately) for proper handling.