This 4 oz. specimen container provides a “full-turn” screw thread cap, which offers an excellent “leak-proof” seal that meets the NCCLS Specimen Handling Guidelines for primary containers. These versatile, graduated, polypropylene containers with polyethylene caps can be used for almost any liquid or solid specimen for either storage or transport purposes. They come with color coded caps: Green for individually wrapped sterile caps; White for non-sterile ones.