Jie An's plastic cups and lids, plates, trays, food containers and other thermoforming food packing products are available in various plastic materials, such as Polypropylene, Polystyrene and PET etc. Polypropylene– A lightweight, durable material that is crack and shatter resistant. Polystyrene – A sturdy, rigid material. PET- A resealable, shatter-resistant and recyclable material with high strength and transparency.