The supplied Ria Vial is a polypropylene (or polystyrene) tube generally used in Radioimmunology Assay, a scientific method used to test antigens without the need to use a bioassay. These vials are commonly used for storage of biological material, human & animal cells. The Cap is provided with a built in seal ring making the vial leakproof. The offered test tube, also known as a culture tube or sample tube, is a common piece of laboratory glassware consisting of a finger-like length of glass. The offered Ria Vial is very efficient and useful. They are available in various sizes and specifications.