What kind of commodities do commodity prices in the natural rubber futures market refer to?

Rubber in the futures market has a fixed subject matter, which is explained by Shanghai Futures Exchange as follows:

Standard: 1, domestic natural rubber (SCR WF), the quality conforms to the national standard GB/T808 1-2008.

2. Imported No.3 smoke film (RSS3), the quality of which conforms to the International Standard for Grade Quality and Packaging of Natural Rubber (Green Paper) (version 1979).

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