Also designed for the collection, transport and storage of specimens, the polypropylene containers are safe to use even in adverse conditions. This model uses a different tamper evident concept when compared to the C575 Series. No locking tab is necessary when the tamper-evident feature is used. Simply screw the cap on the container and the tamper-evident sealing ring is automatically locked in place. When unscrewed, the ring is detached from the cap, showing clearly that the container was opened. Containers are uniquely stackable, shatter resistant and are manufactured from virgin, polypropylene.