These containers are specifically designed for safe, secure collection of biological specimens for laboratory evaluation. These cups are not recommended for transport. The container features accurate, easy-to-read, molded-in graduations on three sides. Top and bottom ribbed etchings ease the opening and closing process when wearing examination gloves. Containers are flexible, crack-resistant and are manufactured from virgin, high clarity, chemically inert, medical grade polypropylene. Listings below include natural caps. For color-coded caps, call American Screening customer service for details.