Regular Wall (polypropylene) Plastic Jars offer a cosmetic appearance at a very economical price. This 4 oz natural PP regular wall jar has a 58-400 continuous thread neck finish. It is straight sided, which in packaging terminology describes the sharp angle between the side wall and the base of the jar. PP jars are perfect for multiple products such as personal care products such as bath salts, creams, balms, gels, body scrubs, and ointments.