Yes The outer disk is the cumulative turnover of the transaction price at the selling unit price. Plastic futures is a unique futures product in China, and there is no relevant contract in the world. Plastics will be affected by the fluctuation of international crude oil prices. Pvc futures have an outer disk. Polyvinyl chloride (PVC for short) is a polymer formed by polymerization of vinyl chloride monomer (VCM) in initiators such as peroxides and azo compounds or under the action of light and heat according to the free radical polymerization mechanism. Vinyl chloride homopolymer and vinyl chloride polymer are collectively referred to as vinyl chloride resin.