Our black containers are made mostly of polypropylene, a great option for personal care products, serums, putty, clay, lotions, creams, cleansers and other products. Polypropylene (PP) is light-weight and very durable. It has a high shatter-resistant rating, is flexible and resistant to fatigue and heat. Polystyrene (PS) is also light-weight and hard, however it has limited flexibility and is more brittle than other plastics. It's shiny, almost glass-like appearance is very classy, however if you are using essential oils, it may cause the PS to leak.
The double wall jars are a two piece container. It has a shell and the liner, two containers nested inside one another to create two walls. Check out the different sizes and find the one right for you.