Wheaton Valumetric Bottles are manufactured from clear soda lime glass that conforms to USP Type III requirements. Graduations in milliliters and ounces provide an approximate volume measurement of content. Partitioned carton protects bottles from scratches during shipping, and they become useful for storing samples. Each case of bottles also includes a hazardous communication label and tamper evident seal if labeling and / or sealing the bottles is required. Extra screw caps can be purchased separately.