The B306BK is an 8 oz black HDPE plastic cylinder round bottle with 24-410 neck finish. Cylinder bottles have sharp square shoulders and a square 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. This item has a 24-410 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.