Containers in Polypropylene with snap on caps. I deal for sampling and storage of liquid, powder or solid samples, where the integrity of the sample if of high importance. Once the container is sealed it cannot be opened again unless the security seal is broken, the cap is also reusable for normal resealing after opening.  Chemically resistant to most chemicals. Containers come in various sizes and is Ideal for drug tests and forensic sampling. Containers is also available in sterile single wrapped option. Lids is also available separately for resealing purposes.