Description: 1 oz. bottle HDPE cylinder round bottle with 20-410 neck finish. This bottle is perfect for a sample size lotion. It can also be used for shampoos and liquid soaps. Perfect for samples of new products. cylinder round bottle with 20-410 neck size. This Cylinder bottles have sharp square shoulders and a square heel (the angle at the base). 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. 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. The first number refers to the diameter (in mm), and the second refers to the closure depth, style and thread. finish.