The B1654CL is a 500 mL clear PET plastic metric oblong bottle with 28-400 neck finish. This bottle is a metric oblong bottle, that means that it has a rectangular base and has a capacity specifically designed to meet the metric system. 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 28-400 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. This container is clear, making it an ideal display container for your product.