The B1547CL is a 12 oz clear PET plastic sprayer bottle with 28 mm ratchet neck finish. The sprayer bottle is intended to be paired with a trigger sprayer or small cap. They have a tall tapered neck to aid in gripping the bottle when using the trigger sprayer. 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.