The B554BK is a 1 gallon black PET plastic wide-mouth pill packer bottle with 110-400 neck finish. This container has a wider proportional mouth than normal bottles. Packers come in a variety of sizes, but they are typically "squatty" in shape with a wider mouth. Packers are used extensively for pills, capsules, supplements, powders, and other health-related products. Polyethylene terephthalate (PET) is marked with the resin identification code of 1. PET is of the polyester family and has high clarity, good chemical resistance, high impact resistance, and medium rigidity. PET is also light-weight and is used for products containing essential oils. Avoid using PET containers to store products that contain essential oils greater than 5% or fragrance oils greater than 15%. If your oil percentages exceed these respective levels, please consider using glass. This item has a 110-400 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.