The B040NTUN is a 1 gallon natural-colored HDPE plastic industrial round bottle with 38-400 neck finish in UN standard box. Industrial round bottles are typically large-capacity round containers with a handle and label panel. The label panel is the depressed section on the sides of the container. The ridges above and below the label panel protect the label from coming in contact with neighboring containers. High density polyethylene (HDPE) is marked with the resin identification code of 2. HDPE has a high tensile strength, good resistance to chemicals, good impact resistance, highly rigid, and highly scratch resistant. This item has a 38-400 neck finish. The first number refers to the diameter (in mm), and the second refers to the closure depth, style and thread. This container can be paired with a closure with a matching finish. natural-colored containers are not actually colored. This is the natural color of the plastic, which is a milky translucent color. This translucent color shows product level, or how full (or, if you're a pessimist, how empty) the container is.